Nothing really all Calvus and Comp's look alike in my opinion, I bought these from Little Africa Aquatics as 1.5" Juvies they were sold to me as F1's from his wildcaught stock parents.. I also have a tank of Comp's Gold heads and Orange Mwela I just like the body shape and the habits they have..
I'm so getting these when I finally get my big African tank up...I think they're the coolest looking thing, body shape, color (I love dark fish with one or two accent colors). They look great Pit!