🐠 Aquarium Journal

🧪 The Balance Experiment — Phase 2 Synopsis

Dates Covered: April 28 → May 14, 2026
Days Covered: Day 17 → Day 33

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🚀 PHASE 2 OBJECTIVE

• Goal:
  • Improve circulation
  • Reduce stagnant zones
  • Observe nitrate accumulation behavior
  • Study Black Beard Algae (BBA) response
  • Improve overall ecosystem efficiency
• Independent Variable:
  • Return nozzle direction changed
• Constants Maintained:
  • Feeding schedule
  • Fertilizer schedule
  • Air systems
  • Lighting schedule
  • Overall filtration structure

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📅 DAY 17 — April 28, 2026

(Phase 2 Begins — Flow Optimization)

• Pre-Flow Change Reading:
  • Nitrate: ~5 ppm
  • Temp: 76.4°F
• Actions:
  • Dosed 1 pump NilocG Thrive AFTER testing
  • Redirected return nozzle
• New Nozzle Configuration:
  • Nozzle location: right rear
  • Direction: toward left front corner
  • Angle: slightly upward
  • Random flow generator nozzle
• Immediate Observations:
  • Increased plant movement
  • Softer distributed circulation
  • More leaves visibly “dancing”
  • No aggressive turbulence
• Betta Behavior:
  • Betta actively explored new flow pattern
  • Swimming through, over, and under flow
  • No stress behavior observed
• Insights:
  • Cross-tank circulation immediately noticeable
  • Plants helping diffuse strong current naturally

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📅 DAY 18 — April 29, 2026

• Top-Off:
  • 2 containers
• Observations:
  • Fish behavior normal
  • Plants healthy
  • System stable
• Insights:
  • New flow pattern did NOT dramatically increase evaporation
  • Flow appeared gentle and balanced

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📅 DAY 19 — April 30, 2026

• Nitrate:
  • Low range (~5–10 ppm)
• Temp:
  • 76.4°F
• Observations:
  • Fish normal
  • Plants healthy
  • System stable
• Insights:
  • Nitrates remained in low range after flow adjustment
  • Suggested possible improvement in circulation efficiency
• Important Correction:
  • Realized nitrate test kit difficult to interpret between:
    • 5 ppm
    • 10 ppm
    • 20 ppm
• New Interpretation System:
  • 0–20 ppm = LOW RANGE
  • 20–40 ppm = MODERATE RANGE
  • 40+ ppm = ACTION RANGE

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📅 DAY 22 — May 3, 2026

• Nitrate:
  • Low range (~10 ppm)
• Temp:
  • 76.6°F
• Top-Off:
  • 4 containers
• Observations:
  • Strong plant growth
  • Fish normal
  • No visible stress
• Insights:
  • System maintained low nitrate range despite low sump water level before top-off
  • Suggested improved nutrient processing or stronger plant uptake

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📅 DAY 25 — May 6, 2026

• Nitrate:
  • Closer to ~20 ppm
• Temp:
  • 78.9°F
• Top-Off:
  • 4 containers
• Actions:
  • Fertilizer dose delayed by 1 day
• Observations:
  • Fish healthy
  • Plants healthy
  • System stable overall
• Insights:
  • Temperature spikes continue correlating strongly with:
    • increased evaporation
    • increased concentration effects

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📅 DAY 27 — May 8, 2026

(Phase 2 Ceiling Reached Again)

• Nitrate:
  • Clearly above 20 ppm
  • Estimated closer to ~40 ppm
• Temp:
  • 76°F
• Observations:
  • Fish behavior normal
  • BBA mostly unchanged overall
  • One localized BBA area spreading slightly
• Critical Observation:
  • Expanding BBA area located in low/no-flow zone
  • Nearby leaves showed little movement
• Major Insight:
  • Localized stagnant areas may contribute more strongly to BBA persistence than general overall flow
• Actions:
  • ~50% display water change
  • Near-complete sump drain/refill
  • Trimmed/replanted tall stem plants
• Plant Maintenance:
  • ~2 stems became ~7 replants
  • Goal:
    • improve lower light penetration
    • improve circulation through plant groups
    • maintain plant mass
• Additional Observation:
  • Kuhli loaches rarely visible
  • Realization that dense planted systems reduce visibility of cryptic fish
• Post-Water Change Reading:
  • Nitrate reset to low range (~5–10 ppm)

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📅 DAY 30 — May 11, 2026

• Nitrate:
  • Low range (~5–10 ppm)
• Temp:
  • 76.9°F
• Top-Off:
  • 2 containers
• Observations:
  • Fish healthy
  • Plants healthy
  • Stable ecosystem behavior
• Insights:
  • Tank becoming highly predictable after resets
  • Temperature + evaporation emerging as major system drivers

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📅 DAY 33 — May 14, 2026

(Current Status)

• Nitrate:
  • Low range (~10 ppm)
• Temp:
  • 76.6°F
• Top-Off:
  • 4 containers
• Observations:
  • Fish behavior normal
  • Plants healthy
  • No livestock stress
• BBA:
  • Slightly increased/spread
  • Still localized rather than tank-wide
• Flow Notes:
  • Some low-movement plant zones still present
• Major Insight:
  • Flow optimization alone did NOT eliminate BBA persistence
  • Tank appears biologically stable but not fully balanced against algae

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📊 PHASE 2 CONCLUSIONS (CURRENT)

• Findings:
  • Cross-tank flow improved circulation awareness
  • Localized stagnant zones became easier to identify
  • Flow optimization alone did NOT prevent eventual nitrate accumulation
  • System repeatedly stabilized after maintenance resets
  • BBA appears more connected to localized stagnant areas than tank-wide circulation
  • Temperature and evaporation strongly influence system behavior
  • Tank ecosystem becoming increasingly predictable and readable

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🌿 CURRENT ECOSYSTEM STATE

• Current Tank Behavior:
  • Stable
  • Predictable
  • Recoverable
  • Plant-dominant
  • Biologically mature
• Ongoing Challenges:
  • Localized BBA persistence
  • Long-term nitrate accumulation cycle
  • Evaporation-related concentration shifts

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🚀 NEXT PHASE

Phase 3 — Air Cycle Experiment

Locked Start Date:
May 18, 2026

• Planned Test:
  • Shared air pump OFF during portions of daytime
  • Shared air pump ON at night
  • Return pump remains ON 24/7
• Goal:
  • Study gas exchange balance
  • Observe possible CO₂ retention improvements
  • Observe effects on:
    • plant growth
    • BBA behavior
    • overall ecosystem balance

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🧪 Experiment Scope

• Window: 17-day system observation (Phase 1 completion → Phase 2 activation)
• Primary objective: Nitrate-control without forced schedule-based intervention
• Secondary objective: Validate ecosystem self-regulation across flow, plants, and filtration layers

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━━━━━━━━━━ PHASE 1 — Completion Log ━━━━━━━━━━

• Goal: Complete reset stabilization after deep-maintenance and Day 0 nitrate experiment start.
• Method:
  • Hold normal feeding rhythm with no emergency water-change override.
  • Track nitrate response against plant uptake and filtration consistency.
  • Use targeted BBA observation points instead of broad chemical escalation.

📅 Day-by-Day Checkpoints (Phase 1)

• Day 1–3:
  • Post-reset nitrate collapse into low range confirmed.
  • No instability signals in fish behavior or circulation pattern.
• Day 4–7:
  • Plant mass maintained active uptake with no major melt cycle.
  • Flow distribution remained even across display and sump return zones.
• Day 8–12:
  • Nutrient curve remained controlled with no abrupt spike event.
  • BBA pressure stayed localized to prior hardware-prone zones.
• Day 13–17:
  • System held stability without forced reset maintenance.
  • Phase 1 exit criteria met: controlled nitrate trend + stable biological response.

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🧰 Phase 1 Technical Notes

• Filtration behavior:
  • Mechanical pathway remained consistent after prior media refresh.
  • No major evidence of flow choke or restart instability during observation window.
• Plant subsystem:
  • Refugium + display mass continued acting as primary nutrient sink.
  • Trim discipline prioritized dead-zone removal over aggressive reshaping.
• Algae control posture:
  • BBA monitored as indicator species for imbalance pockets.
  • Escalation threshold deferred pending Phase 2 flow optimization results.

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━━━━━━━━━━ PHASE 2 — Activation Protocol ━━━━━━━━━━

• Activation trigger: Phase 1 stability confirmed across nitrate, behavior, and mechanical flow.
• Phase 2 objective: Convert stability into repeatable balance by tightening flow-path efficiency and nutrient capture continuity.

🚀 Phase 2 Action Stack

• Flow Optimization Layer
  • Prioritize return-path uniformity to reduce detritus settlement pockets.
  • Use hardware-zone inspection points as recurring turbulence checks.
• Nitrate-Control Layer
  • Continue nitrate-driven water change logic (no calendar-first resets).
  • Track trend direction over point readings to avoid over-correction.
• Ecosystem-Balance Layer
  • Keep plant mass density stable in both display and sump zones.
  • Preserve biological filtration continuity during any minor media adjustments.

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📌 Phase Conclusions & Forward Controls

• Phase 1 result: Completed successfully with stable nitrate behavior and no corrective emergency maintenance events.
• Phase 2 status: Active.
• Next validation target:
  • Confirm flow optimization lowers recurring BBA pressure zones.
  • Confirm nitrate-control remains stable under normal feeding variance.
  • Confirm system can sustain balance with minimal intervention cadence.

• Performed a standard maintenance water change with additional filter and plant adjustments.
• Pre–water change nitrate levels measured between 40–80 ppm, indicating elevated nutrient buildup. Completed the usual large-volume change:
  • ~90%+ sump drain
  • ~70–75% display drain

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• 🔧 Filtration Updates
  • Replaced polyfill layer
  • Replaced 5-in-1 filter sponge (Temu media) positioned before the polyfill
  • Dosed Stability to support bacterial re-establishment following media replacement
  • Dosed Prime during refill as usual

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• 🌱 Plant Maintenance
  • Trimmed Java moss in both sump and display
  • Removed and discarded browned/decaying sections
  • Transferred healthy moss from display into sump to maintain refugium density
• Plant mass remains strong and actively growing.

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• 🧪 Experiment Begins — Day 0
• This maintenance marks the start of a new system experiment:
• Transitioning from schedule-based water changes → nitrate-driven water changes
• Goal:
  • Reduce unnecessary large water changes
  • Allow system to find natural nutrient balance
  • Track nitrate accumulation under current lower bioload + high plant mass

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• 📊 Follow-Up Reading
• 📅 April 14, 2026 (Day 3)
  • Nitrates measured at ~5–10 ppm
• This indicates:
  • Strong nutrient uptake from plants
  • Effective reset from the April 11 water change
  • System ready for controlled observation phase

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• 📌 System Status
  • Filtration refreshed
  • Plant mass redistributed and cleaned
  • Nitrates reset to low range
  • System stable
• Tank is now officially in a controlled nitrate-monitoring phase.

SUMMARY

Intermittent sump overflow occurring after turning the system back on following feeding. Issue appears inconsistent and may be related to flow restriction or temporary imbalance.

DETAILS

The sump is not intentionally overfilled, but on multiple occasions water has risen and overflowed from the top after restarting the system.

Typical routine:

• Sump is turned off during feeding
• Left off for ~45–60 minutes
• Turned back on afterward

Observed behavior:

• Some restarts: normal operation
• Other restarts: sump begins to overflow shortly after turning back on

Recent incident:

• Sump turned off
• Turned back on shortly after (~5 minutes)
• Overflow occurred almost immediately

Possible contributing factors:

• Intake/overflow tube from display to sump has not been cleaned recently
• Potential intermittent clog or restriction
• Possible temporary surge in return flow vs drain rate

NEXT STEPS

• Inspect and clean intake/overflow tube
• Check for partial clogs or biofilm buildup
• Observe restart behavior closely after cleaning
• Evaluate sump operating water level vs max capacity

• Performed an extensive maintenance session focused on filtration, flow, and system reliability.
• Completed a near-total sump drain (~100%) and a reduced ~50% display water change to avoid over-stressing the system during heavy maintenance.
• 🔧 Filtration & Cleaning
  • Rinsed coarse and medium sponges in the filter stack
  • Rinsed pre-return sponge/filter due to clogging
  • Removed spent Purigen (replacement needed)
• Due to the level of cleaning (including tap water exposure), Stability was dosed to support bacterial recovery. Prime was also dosed during refill as usual.

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• ⚙️ Mechanical Fix — Overflow Issue
  • Check valve in return line was stuck open due to debris
  • Disassembled and cleaned the valve
  • Restored proper function (pending confirmation under test)
• This was likely allowing unintended backflow, causing sump overfill during shutdown events.

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• 🌱 Plant Management
  • Planned trimming of tiger lotus postponed to avoid stacking stress with major maintenance
  • System showing strong plant growth despite reduced bioload

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• 🧪 Forward Plan (System Experiment)
  • Replace nitrate test kit
  • Begin observing natural nitrate accumulation under current lower bioload
  • Potential shift toward:
    • Nitrate-driven water changes instead of fixed schedule
    • Smaller display changes (~25% or less) while maintaining sump maintenance

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• 📌 System Status
  • Bioload reduced compared to previous months
  • Plant growth accelerating
  • Filtration refreshed
  • Mechanical reliability improved (pending validation)
• System entering a “controlled observation phase.”

• Performed the weekly maintenance water change.
• Completed a large water change, draining approximately 90%+ of the sump and ~70–75% of the display. This session included additional cleanup and preparation for a new algae-control experiment.
• Maintenance performed:
  • Replaced intake netting due to heavy buildup of black beard algae (BBA)
  • Rinsed pre-pump sponge to remove debris and restore flow
  • Light system cleanup to reduce accumulated organic matter
• Dosed Prime during refill and added Stability due to media disturbance and net replacement.
• Preparing to begin a new 24-hour “Aquarius” treatment experiment targeting remaining BBA. This will be monitored closely to evaluate effectiveness and plant safety.
• System remains stable heading into the experimental phase.

• Performed the weekly maintenance water change.
• Completed a large water change, draining approximately ~99% of the sump and ~70% of the display. The larger change was paired with plant maintenance during this session.
• Maintenance performed:
  • Trimmed Java moss in the display tank
  • Transferred moss trimmings into the sump to continue growth and nutrient uptake
  • Trimmed pothos plants growing from the sump
• Current pothos maintenance method involves rotating growth: new cuttings are placed back into the original planter container where the earlier vines originated. This keeps a continuous propagation cycle between the tank sump and the plant container.
• Prime was dosed during refill as usual.
• Purigen media remains in service and is estimated to have approximately one month of life remaining before the next replacement cycle.
• System remains stable.

• Finally completed a long-overdue water change after a hectic couple of weeks.
• Due to being out of nitrate test kits, pre–water change nitrate levels were not measured. Despite the delay, all remaining livestock appeared stable and active, showing no visible signs of stress.
• Performed a standard large-volume maintenance:
  • ~90% sump drain
  • ~70% display drain
  • Dosed Prime during refill as usual
• Notably, the moss growth has accelerated significantly during this period and is now overgrown. A trimming session is planned to restore structure and prevent shading.
• Overall system appears stable despite the delayed maintenance window.

• Performed a follow-up stabilization water change.
  • Sump: Drained as much as possible
  • Display: ~50–60% drain (experimenting with smaller display changes)
  • Prime was properly dosed prior to refill
• Last week included two water changes:
  1. The initial large change where Prime was accidentally omitted.
  2. A midweek corrective water change (Wednesday) to support recovery.
• Current livestock status:
  • Remaining Cherry Barbs
  • Betta
  • Kuhli Loaches (when visible)
  • Shrimp and snails
• The visual density of the tank is noticeably reduced due to recent losses, but the system appears stable. No new signs of distress observed.
• Moving forward, experimenting with slightly smaller display water changes while maintaining heavy sump turnover.
• System focus: stability, bacterial support, and slow recovery.

A difficult entry to write.

Following a routine water change on February 9, 2026, Prime was accidentally not added during the refill. Within 24 hours, significant fish loss was observed.

Losses included:

• All Cardinal Tetras (long-term residents, over 8 years)
• Multiple Panda Loaches

Upon discovery, deceased fish were removed immediately to prevent secondary water quality issues. Invertebrates (shrimp and snails) had already begun scavenging, indicating rapid onset following exposure.

Prime was dosed as soon as the issue was identified. Feeding was reduced to very light amounts, and Stability will be added to support biological recovery.

Additional monitoring and potential mid-week water changes are planned to maintain stable parameters.

This event appears to be an acute water conditioning error, not a systemic or long-term husbandry issue.

Weekly maintenance recap:

• Performed a routine water change to close out the month.
• Pre–water change nitrate levels tested between 10–20 ppm, remaining within a stable range. Completed a normal water change using the usual large-volume method.
• During maintenance, Purigen was replaced along with the polyfill layer placed on top of it. The previous Purigen had been in use since mid-November, making this a scheduled and timely media refresh.
• Due to the media change, Stability was dosed to support beneficial bacteria and maintain biological balance.
• No other adjustments were made during this maintenance cycle.
• System remains stable heading into February.

Weekly maintenance recap:

• Performed a routine weekly water change following a week of heavier fertilizer dosing.
• Pre–water change nitrate levels measured at approximately 40 ppm, consistent with increased nutrient input. Completed a standard large water change with approximately 95% of the sump and ~80% of the display drained.
• Completed a moderate trimming of pothos in the refugium, as growth had become dense. Trimmings were removed in preparation for propagation, helping maintain healthy nutrient uptake and prevent overcrowding.
• No other system adjustments were made during this maintenance session.
• Tank remains stable following maintenance.

Weekly maintenance recap:

• Performed the weekly water change and minor plant adjustments.
• Pre–water change nitrate levels tested just under 40 ppm. Completed the usual large maintenance drain with approximately 95% of the sump and ~80% of the display water removed.
• Completed light replanting of the tri-color lotus, repositioning growth for better spacing and continued development.
• No other major changes were made during this maintenance session.
• System remains stable following maintenance.

Weekly maintenance recap:

• Performed routine maintenance and a partial water change.
• Pre–water change nitrate levels tested between 20–40 ppm (below 40). The display tank was drained approximately 50%, less than usual, due to additional filter maintenance performed during this session.
• All filter media were temporarily removed and gently squeezed out in tank water, and the filter chamber was cleaned to remove accumulated detritus and suspended particles. This was a maintenance-focused reset rather than a corrective water change.
• Newly added shrimp (introduced 2–3 days prior) are acclimating well and showing active, exploratory behavior throughout the tank.
• Inkbird temperature probe(s) were moved from the sump back into the display tank to improve temperature monitoring and regulation during water changes. A dedicated sump heater may be added in the future.

SUMMARY

Updated display and sump lighting schedule to gently increase photoperiod using split timing and intentional overlap, with the goal of promoting soft green algae growth for snails while maintaining overall system balance.

DETAILS (RAW RAMBLE)

I decided to refine the light increase instead of adding the full 30 minutes all at once. I’m splitting it into 15 minutes at the start and 15 minutes at the end of the display photoperiod to create a longer dawn and dusk rather than a harsher light extension.

I’m also extending the sump/refugium lighting and intentionally overlapping it with the display lights. I’ve noticed the moss in the refugium has been growing rapidly even before this light change, which tells me the system is already responding well and has the capacity to handle a slightly longer light period.

The goal here is not to cover the tank in algae, but to encourage soft green film algae as a natural, constantly available food source for my snails and shrimp. I’d rather have them primarily grazing on naturally growing food and supplement with algae wafers, instead of relying on wafers as the main food source.

UPDATED LIGHTING PLAN

Display Tank (Photoperiod Increase via Split Timing):

• Previous schedule: 12:00 PM → 8:00 PM (8.0 hours)
• New schedule: 11:45 AM → 8:15 PM (8.5 hours)
• Change method: +15 minutes at start, +15 minutes at end

Sump / Refugium Lighting (Extended with Overlap):

• New schedule: 10:45 AM → 9:15 PM
• Overlap: 1 hour before display turns on and 1 hour after display turns off

INTENT & OBSERVATIONS

• Glass is very clean, indicating low natural algae availability
• Snails may be running out of grazing surfaces
• Refugium moss growth has been strong prior to this adjustment
• System appears stable with strong nutrient uptake and filtration

GOALS

• Encourage soft green algae growth for snails
• Maintain a clean display without nuisance algae
• Improve invertebrate nutrition through natural grazing
• Use algae wafers as a supplement, not the primary food source

New year maintenance recap:

• Performed the first water change of 2026 as part of routine system maintenance.
• Pre–water change nitrate levels measured approximately 10–20 ppm, remaining within the stable target range; drained roughly 90% of the sump and about 75% of the display.
• Fertilizers were dosed only once during the past week, reflecting lower nutrient demand and overall system stability.
• No additional adjustments were required during this maintenance cycle.
• The system continues to show steady balance heading into the new year.

Weekly maintenance routine with minor system adjustments:

• Performed a scheduled water change as part of ongoing system maintenance.
• Pre–water change nitrate levels measured approximately 20–40 ppm. Completed a normal water change with the usual large drain from both the sump and display.
• Carried out light plant trimming, removing older or declining growth.
• Moved a cuttlebone from the sump into the display tank to provide a more direct calcium source for livestock.
• Dosed Prime during refill as part of the standard water-change routine.
• System remains stable following maintenance.

Weekly maintenance checklist during the post-BBA stabilization phase:

• Performed a scheduled water change as part of ongoing post-BBA stabilization.
• Pre-water-change nitrate levels measured approximately 10–20 ppm, within target; drained roughly 90% of the sump and about 80% of the display.
• Completed a moderate plant trimming, focusing on overall shape and removing older growth.
• Replaced one filter sponge as part of routine filter upkeep.
• Dosed Prime during refill and added Stability to support beneficial bacteria after introducing new filter media.
• System remains stable following the end of Excel treatment, with ongoing focus on balanced nutrients and steady biological filtration.

Highlights from this week’s maintenance cycle:

• Performed the weekly water change with ~90% drained from the sump and ~75% from the display.
• Pre–water change nitrate measured around 20 ppm.
• Loss of one Celestial Pearl Danio — first loss from the newest group; age at purchase unknown and losses can occur unexpectedly with small schooling fish.
• Completed light moss trimming in the display and moved trimmings into the refugium for continued growth.
• Finished maintenance with a standard cap dose of Seachem Excel.
• Overall system remains stable.

Completed December's first water change on December 7, 2025, kicking off the weekly recap cycle for the month.

Each weekly recap will track:

• Nitrates and key parameters
• Plant health and growth
• BBA control spot-checks
• Any livestock changes or observations

Current status: Tank stable at 5 ppm nitrates, BBA nearly eliminated, all fish healthy with bright colors.

December 2025 logs will focus on confirming long-term stability after the successful BBA control push.

Conducted the first weekly check-in after the December 7 water change. Nitrate held steady around 5–10 ppm with clear water and no new algae patches forming.

Fed flakes and bloodworms; fish responded with strong appetite and normal behavior. Plants are pushing new growth where older leaves were trimmed back, and flow remains consistent after the sump sponge rinse.

Dosed a maintenance cap of Seachem Excel and deferred any additional water changes. Continuing to monitor BBA-prone spots while keeping nutrients stable.

Lost one of the original cherry barbs from the 2017 crew today due to natural aging. At approximately 8 years old, this fish far exceeded the typical cherry barb lifespan of 3-5 years, demonstrating the tank's long-term stability and quality care over nearly a decade.

This crew has been with me since the beginning—survivors of countless water changes, equipment upgrades, and my own learning curve as an aquarist. Losing a fish to old age after 8 years isn't a failure; it's proof that the fundamentals are working.

Tank Legacy: This cherry barb witnessed:

• Setup and initial cycling (2017)
• Multiple equipment iterations and improvements
• Transition to planted tank setup
• Recent BBA treatment success (2025)
• Hundreds of water changes and maintenance cycles

All other fish from the original 2017 crew remain healthy with bright colors and normal behavior. The tank's long-term stability continues.

After two months of targeted Excel spot treatments and flow optimization, BBA has been reduced to almost nothing. The November campaign was highly successful—what started as medium patches covering hardware and high-flow zones is now barely visible.

Treatment Strategy That Worked:

• Daily Excel spot dosing on problem areas throughout November
• Removed restrictive poly-fil from refugium chamber
• Added coarse sponge to improve flow patterns
• Maintained stable nitrates (5-10 ppm)
• Amano shrimp grazing on weakened algae

Current Status: Only trace amounts remain in isolated spots. Nearly all visible patches eliminated. Continuing routine Excel maintenance doses (1 capful) to prevent recurrence.

From approximately 50% coverage in early November to nearly 0% in early December. This validates the Excel + flow optimization approach for BBA control without plant damage.