Fish gasp at the surface when oxygen levels are low or water quality is poor.
Common causes
- Low oxygen
- Dirty water
- High ammonia
- Overcrowding
1. Low oxygen
Warm water holds less oxygen.
Quick fixes:
- Add an air stone
- Lower water temperature slightly
2. Dirty water
Waste builds up fast.
Quick fixes:
- Do a 30% water change
- Clean the filter
3. High ammonia
Toxic to fish.
Quick fixes:
- Test water
- Add ammonia remover
What to try first
Do a partial water change.
When to call a professional
If multiple fish gasp at once.