Im not sure about a black nasty but from my experience with dovii their part satan part fish had a male that took out out a female texas after spawning three times with her and two female blood parrot a convict and about three other fish plus a 5 inch iridescent shark which he also ate quik style and also put teeth marks in the handle of a algae scrapper but he was one of my favorite cichlids aslo had a female a while back that bit my hand while removing her from a hundred gallon with a net but if it ain't mean and pretty I dont want it
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dovii for sure, i have both, the haitiensis are only about 2-3 inches but at this size my male dovii had already killed off his other 2 siblings in a 90 gallon tank
It depends on individual fish. Right now both my haits and dovii have great personalities and aggression here is a video with both interacting http://youtu.be/sUjtp1k30dk
I might be able to help you with the bloat issues in haits not to mention I have two batches doing excellent right now. Both batches are defying the bloat fears