thats funny because a simular sized dovii with my Butti's would Be curtains 4 em!! African Cichlids kno how 2 throw down hence they bite the stomaches of a contender(Good techniec if you ask me)
Gotta go with my dovii pair. They're the absolute meanest fish I've ever seen. Sometimes they attack the glass so hard I think the tank is going to crack! Also, I've never had an umbie, but I've heard they can be even worse.