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Obviously you're going to do some research, and you can't keep all species together; but here's a few ideas
Killifish
Shrimp
Snails
Betta
Ember tetras
Galaxy Rasboras
Chilli Rasboras
Dwarf Cories
Badis badis? ( look into those)
Sparkling gourami
They are actually alot easier to keep than most people say. I have never had any that would not eat frozen food. They are sensitive to stress like rearranging or moving the tank though.