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ProblemsHair Algae

algae

Hair Algae

Long green strands coat plants, hardscape and glass. Common in young or bright tanks.

Symptoms

Long green hair-like strands on plants and decor
Attaches to slow-growing plants and rock
Grows rapidly under long photoperiods

Common Causes

Photoperiod too long or light too strong
Phosphate and nitrate imbalance
Low plant mass relative to nutrients

What to Check

Light duration and intensity
Phosphate and nitrate readings
Plant health and surface coverage

What Not to Do

Do not just pull it out — it regrows from the base
Do not run a long blackout without addressing nutrients

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This guide is informational and does not replace professional veterinary advice. If fish are severely ill, consult a veterinarian.