Just out of curiosity, what, in your opinion, is the meanest, toughest new world cichlid in domestication? Granted, it's not something I'm looking to buy, but it's just something that I've been curious about for some time 

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Dovvi, Umbie, Black Belts, Haitians pretty much any of the big predatory Central American Cichlids.
Dovvi, Umbie, Black Belts, Haitians pretty much any of the big predatory Central American Cichlids.
Wills, what is the fish called in your pic?
Dovvi, Umbie, Black Belts, Haitians pretty much any of the big predatory Central American Cichlids.
Wills, what is the fish called in your pic?
It's a female Nicaraguan Cichlid - plenty of attitude (even when young) but not quite the same league as the others mentioned so far.
Oh, do females have the blue only?