Guide
Why is my betta (Siamese fighting fish) not eating?
Common causes and what to do when your betta stops eating or ignores food.
- Test water (ammonia, nitrite); ensure temp is 76–82 °F. Fix water quality first.
- Reduce stress: cover, calm tank mates, gentle flow.
- Try different food or a short fast; don’t overfeed. If it goes on for days with other symptoms, consider illness.
Check water first
Ammonia or nitrite in the water stresses fish and kills appetite. Test your water — if either is above zero, do a water change and fix the cause (overfeeding, overstocking, or an incomplete cycle). Bettas also need warm water (76–82 °F); a cold or fluctuating tank can make them lethargic and off food. Log parameters in App-aquatic so you spot problems early.
Stress and environment
New tank, new fish, or aggressive tank mates can make a betta hide and refuse food. Give them cover and quiet. If you added new fish or moved the tank, give it a few days and offer food in small amounts. Strong current can stress long-finned bettas; baffle the filter if the flow is heavy.
Food and routine
Some bettas are picky. Try a different pellet size or brand, or offer frozen/thawed bloodworms or brine shrimp as a treat. Soak pellets briefly so they sink slowly. Don’t overfeed to “make up” — one or two small meals a day is enough. Remove uneaten food so it doesn’t rot.
When to worry
If water is good, temperature is stable, and the betta still won’t eat for more than a few days, look for other signs: clamped fins, bloating, spots, or listlessness. See our fish illnesses guide and consider a hospital tank if you need to treat. Sometimes a short fast (24–48 hours) then a small, tempting meal is enough to reset.
Log parameters, scan strips offline, and run stocking checks with App-aquatic.
Get the free appCheck water first?
Ammonia or nitrite in the water stresses fish and kills appetite. Test your water — if either is above zero, do a water change and fix the cause (overfeeding, overstocking, or an incomplete cycle ). Bettas also need warm water (76–82 °F); a cold or fluctuating tank can make them lethargic and off food. Log parameters in App-aquatic so you spot problems early.
Stress and environment?
New tank, new fish, or aggressive tank mates can make a betta hide and refuse food. Give them cover and quiet. If you added new fish or moved the tank, give it a few days and offer food in small amounts. Strong current can stress long-finned bettas; baffle the filter if the flow is heavy.
Food and routine?
Some bettas are picky. Try a different pellet size or brand, or offer frozen/thawed bloodworms or brine shrimp as a treat. Soak pellets briefly so they sink slowly. Don’t overfeed to “make up” — one or two small meals a day is enough. Remove uneaten food so it doesn’t rot.
When to worry?
If water is good, temperature is stable, and the betta still won’t eat for more than a few days, look for other signs: clamped fins, bloating, spots, or listlessness. See our fish illnesses guide and consider a hospital tank if you need to treat. Sometimes a short fast (24–48 hours) then a small, tempting meal is enough to reset.
More guides · Betta care · Siamese fighting fish vs betta · Water parameters · App