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Do mollies like to be in groups. Because I have one and he stays in one corner all the time the only time he moves is to eat or move to a different corner
Mollys do not school they do like a group, generally one male and 2-3 females works best. They will become pretty sizable and I would not keep them in less than a 20 long.
No male mollys have a stick like anal fin, females have a pair of anal fins. Color has nothing to do with it. Mollys should not be in a ten, try platys or guppys instead.