The latest paper reassigning genera in Vertabrate Zoology by Rican etc has placed them in Wajpamheros. They have had quite the name ride, Theraps, even Amphilophus for a time, Astatheros, and now the new name where they are the only member (so far) of the genus
When I first had them, they were in Amphilophus. Luckily the species name seldom changes.
The one above killed all his brothers and sisters in a 90 gal, almost over night at about 3" in length.
I should have immediately put them in a 6ft tank, and with more current than I did, and maybe with other similar sized juvie cichlids (or other dithers) to spread things out.
I find strong current to be a major factor in holding down aggression in rheophillic cichlids.
I had always heard how aggressive Criboheros rostratum, were, but when I put 15 together in a tank with lots of current, there were no aggression issues.
The current was strong enough to keep plants constantly bent, below is that rostratum tank.