What kind of freshwater fish can be kept in a small fish tank with a filter but no...

Runner6

New member
...heater? The tank is small, one gallon I would say. It has a filter, but no heater so the water will be warm room temperature (My room temperature is much warmer than most though)

It housed a happy single betta for a little over a year...but I'm curious if there is anything else little I can keep in this tank other than a betta? Like the teeny kind of fish or frogs?
But there won't be a heater....just a very warm room temperature.
Any suggestions?
Thanks :)
well id hate to make someting miserable and probably kill it from being in such a small tank....is there really nothing to put in there?
i wonder why they even make them lol
 
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