A flowerhorn is one of the most aggressive cichlids there is.(At least from all my reading) Its aggressiveness was actually an unintended down side to the breeding project. They will kill everything once they hit that nice size. Mine won't even tolerate a clown loach or my heater for that matter. Hope this helps. BTW a flowerhorn would destory a Convict in no time once proper sized. Your talking about some real dental work on those guys. P.S here is my low grade ZZ
