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Crowd thread digest

What the crowd said: hair algae with pea puffers

📊 Thread digest 🌿 Plants & algae 📅 April 2026
Original question

Hair algae took over a cycled tank with five pea puffers. Nerites won’t touch it. Light has been off and no fertilizer for weeks. Manual removal with a toothbrush isn’t enough — advice?

Thread quality (estimated)

0 to 100. Qualitative, not a verdict on who was “right.”

Engagement 80

OP posted test strips; branches on RO/TDS, water softeners and plant melt, CO2 timing, and one “algae vanished overnight” shrimp-tank story vs a six-month teardown.

Contention 65

Water changes with tap vs “know your tap — you might feed phosphates back in”; load Amanos vs pea puffers eat shrimp; vague “pond product” advice.

Agreement 58

Overlap that hair algae is usually light + nutrients + imbalance, that manual removal must pair with fixing the cause, and that puffers are messy (filtration / maintenance expectations).

How we scored it: Qualitative estimates (engagement, disagreement, overlap), not a formula on raw reply counts.

Answers rolled into five bands

Percentages are approximate share of distinct takes in the thread.

Know your water: TDS, phosphates, RO, softeners
Tap high in phosphate blamed for string algae; RO/Rodi + remineralize; ion-exchange softeners and sodium vs plants 24%
24%
Light, CO2 timing, ferts, floaters, feeding
Shorter or dimmer photoperiod, tape on the LED, duckweed/floaters, pause or reduce dosing; CO2 on before lights; less food waste 30%
30%
Manual removal + grow healthy plants + steady water changes
Toothbrush / trim melt; fast stems; weekly ~25% changes once source water is under control; root tabs as part of a staged plan 22%
22%
Pea puffer reality check: filtration, no Amanos, other algae fish
Stronger filter and cleaning; shrimp-eating conflict; Florida flagfish and similar noted but “nippy” — not automatic for a puffer community 14%
14%
Phosphate binders, liquid carbon, odd tangents
Phosphate-removal resins; Excel-style products; sweet potato emergent growth; “it disappeared” luck or restart talk 10%
10%

Where it got argumentative

  • Water changes: default advice vs warnings that tap can import algae fuel (especially phosphates) without testing.
  • Amano shrimp: praised for clearing hair algae fast in some tanks; incompatible with pea puffers in others.
  • Anecdotes: algae “imploding” mysteriously vs months of losing patience and tearing a tank down.

Where people tended to agree

  • Nerites aren’t a cure-all for every algae type or growth stage.
  • You need both cleanup now and a reason it stops growing.
  • Test and know source water if changes don’t help or plants melt.
Practical takeaway
  • For this OP’s setup, the thread points to water chemistry + light + bioload from puffers more than “add one snail species.”
  • Read our structured hair algae guide (also linked in the original thread) and compare with the BBA / crew digest for overlapping algae debates.
  • Track nitrate, phosphate, and TDS trends in App-aquatic while you change one variable at a time.

Note: Crowd threads mix experience levels. Product names in the source thread are user mentions, not medical or label instructions. Follow manufacturer guidance and species safety.

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