Used to have pacu that used to try to eat everything including hand when trying to fix heater but most aggressive fish by far has been red devil I had broke my glass cover when it jumped out water to chase my doobey eye
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Chain pickerel. Not very menacing, but while working in the tank I caught him making quick movements to line up an attack against my fingers. Nasty teeth.
For some strange reason... My vulture cat. It's so fast and like to brush up against my fingers when I'm cleaning the tank. I'd hate to find out how they earned the nickname machete catfish.