I've been bitten by numerous fish. My convict pair actually surprisingly hurt more than you'd expect! The 4.5" female and 5" male hurt bad when they bite together! I've been bitten by my uncles old 15" oscar which drew blood. I've been bitten by my aunts Caribe piranhas and they left marks which are still scarred.
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The mark is on the pointer finger forgive my thumb that's another thing lol not aquarium related you can't really see it but you can see where the skin grew over
-Andrew