Dovii, umbee, chanco, buttikoferi, black nasty, my largest mayan is also very aggressive. Some jags can be but most ive kept were laid back with the exception of my current male i get nervous putting my had in his tank to do maintenance. Like chrisplosion said alot of variables come into play when dealing with hybrids. The flowerhorns aggressiveness depends on what its mix is, and still comes down to individual personalities. I know my flowerhorn is a killer and she is a trimac cross. So my list is all fish that IME are almost always killers.
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