I had a 12"+ Male Trimac in a 120 (4x2x2).
I had three 7-8" females. One was usually in with the male. He was really rough on his girl during spawning, so they rotated out.
The females did fine in other large cichlid tanks. Tank mates such as Oscars, Dempseys, Salvini and similar.
The male was never kind to tankmates. When young he'd nip and run from cichlids tougher than him. He'd kill anything he could. As an adult, he could kill anything smaller than a medium dog (sarcasm).
I did add several adult male Convicts to the 120 gal. I also added many rocks and slate to create areas the Convicts fit, that the Trimacs couldn't. Im sure they were stressed, but it didn't show. It also took a lot of stress off the female.
