Algae fix guide
Fuzz Algae
Also called green fuzz algae
Short soft green fuzz, a few millimetres long, on leaf edges and wood.
By Mike Elmira
TL;DR, Fuzz Algae
Fuzz algae is short green fuzz, only a few millimetres long, that coats leaf edges and hardscape in a young tank. It is a mild imbalance rather than a real problem, and it usually fades as the tank settles. Keep CO2 and nutrients steady, do your water changes, and let amano shrimp and otocinclus graze it. It rarely needs anything drastic, and a stable tank grows out of it within a few weeks.
How to spot it
A short, soft green fuzz, like a fine carpet on leaf margins, wood and slower plants. Much shorter than hair algae and softer than beard algae.
What causes it
- A young tank still balancing CO2 and nutrients
- Minor CO2 fluctuation
- Slightly too much light for a new setup
How to fix it
- Keep CO2 and dosing steady, most fuzz algae fades as the tank matures.
- Stay on weekly water changes to keep nutrients even.
- Add amano shrimp and otocinclus, they graze fuzz off leaves and wood.
- Trim any badly coated old leaves.
Keep it from coming back
Give a new tank time to settle, keep dosing and CO2 steady, and don't overlight it early on.
What eats it
A clean-up crew won’t fix the cause, but these species graze it and keep the last of it down:
Frequently asked questions
Direct answers to the questions search engines and AI assistants surface most often about this species.
Is fuzz algae a sign of a problem?
Not usually. It is a mild imbalance in a young tank and it tends to clear on its own as things stabilise. Steady CO2 and dosing plus a few amano shrimp keep it under control.