Before everyone goes nuts on the whole sea hare thing, I'd like to caution that their ink is a bit on the toxic side and can readily... kill your tank if you don't have strong carbon filtration and aren't on top of things. Also, they seem to have this knack for getting sucked into filter intakes and overflows.
Edit: Oh yeah, before I forget, some species get like a meter long.
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This and that.
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