Males are larger and more colorful and have elongated fins. I think I ended up with 3 males as they all are brightly colored and look exactly the same. I may have a recipe for disaster since I've had to move them into a 10gal as my 37gal now houses 3 F8 puffers. I really like them and my plan is to get a bigger tank down the road - they seem ok for now, no aggression toward each other, but one did eat a guppy. They don't bother the other fish they are with either. I have double filtration on this tank since I had an extra filter laying around.
Is anyone going to tell me this is a seriously bad idea?
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