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I think a clown trigger is very aggressive.you cant but 2 together which i learned years ago.The sharp teeth which i could not hand feed when he reached 4 inches i got bitten.My fault.cause i was acting if he was a pet dog.which they do act like one.Truly a beautiful fish.But i learned 1 per tank.as there truly aggressive..

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water changes are a fish best friend Cichlid power!!!

Just based on the fish I keep, male bettas can be rough since they cannot be housed together.

Another type I keep is the Leporinus fasciatus. I think they are often mistakenly bought young as "pretty community" fish but generally speaking they become terrors as they age, making it almost impossible to keep any fish other than their kind with them.

Most of my fish types have some level of aggressiveness but those two seem to be at the top of my list and haven't been named here yet.

I think the most aggressive fish I've kept is a green spotted puffer, I tried it in a tank with a bicher and he would actually stalk the bichir who was much bigger and bite chunks out of his fins, so puff has his own tank now

amen to that i have dps they will hunt and kill any other fish i put in there tank the are mean as heck and smart as all get out

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ever tought we were really just living in gods tank on his mantal ......;. hope he takes it easy on the salt