What kind of fish can fit into a 1 gallon tank?

I asked this question before about keeping a betta in it but i've decided not to keep one.

I just bought a 1 gallon starter fish tank that comes with an air pump. I want to know what kinds of fish other than a betta can live in it. It would have to be able to live in non-heated water. And please no mean answers. Thanks.


Also how long should i let the tank sit before i get the fish?
 
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