Yeah I'm surprised the two knifes haven't fought yet... I was planning to separate them but seems like they are really docile..... For now lol
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When they are young they can be housed together no problem.
I have 4 in the same tank at around 3 inch no problem.
It's around 10+ inches I'd be careful, but they are rather friendly fish as long as it don't fit in its mouth.
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