What kind of fish are compatible with betas?

I know this question has been asked to death, and is probably fairly easy to find if I google it, but i love asking questions. I have two male betas in seperate 2.5 gallon, filtered tanks. Both are not hostile, and have been kept successfully with other fish before. (At the moment, one is alone and one is living... show more I know this question has been asked to death, and is probably fairly easy to find if I google it, but i love asking questions.

I have two male betas in seperate 2.5 gallon, filtered tanks. Both are not hostile, and have been kept successfully with other fish before. (At the moment, one is alone and one is living with a common goldfish ONLY until he is big enough for the goldfish tank) What other fish should I get?
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