10 gal reservoir?
Answers: Well, you could return with a Betta, but not much is accepted as a tank-mate to them.
10g is a bit small, so a lot of fish aren't suitable for that. Guppies & platies are colorful & a bit hardy, perhaps you could look into getting a couple of those.
Easiest are the livebearers. Mollies, platies, guppies, swordtail. 1" of fish per gallon. Mollies and swordtails grow moderately large so if you want to maximise your number of fish stick next to fancy guppies.
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