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Or you could get a nerite snail (for similar algae control to what otos provide) and then a whole bunch of the really small corys like dwarf cory (Corydoras hastatus), pygmy cory (Corydoras pygmaeus), or salt-and-pepper cory (Corydoras habrosus). I'm not sure about the exact length of the different species of smaller corys, but they're SO cute and SO "the more, the merrier," so if smaller lets you get more, than can only be good!
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