Betta fish lethargic and can't swim: Is a heater always necessary?

Question

I live in Hawaii and was told that I didn’t need a heater for my baby beta fish. I still find my fish to be very lethargic and unable to swim properly. What should I do. Pet's info: Fish | Unknown - Fish | Male | unneutered

Angel Alvarado, LVT · Accepted Answer

Bettas are tropical fish and do best in water between 78 F and 80 F. A heater is typically required to maintain stable temperature. Rapid fluctuations in temp can be stressful. You should also check the water quality and chemistry. Poor water quality can cause the symptoms described. Filtration and regular partial water changes are necessary to keep a tank clean.

Betta fish lethargic and can't swim: Is a heater always necessary?

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