FIREMOUTH (Thorichthys meeki)

Not especially aggressive, though territorial when breeding and may eat much smaller fishes. It can be kept with similarly-sized Central American cichlids but provide enough space to allow each species to form an adequate territory.

Groups of peaceful upper-water dwelling fishes can also be included with the genera Poecilia andXiphophorus particularly suitable since they have representatives in Mexico.

Unless spawning, Thorichthys species are quite gregarious and do best when maintained in groups of 8 or more individuals.

https://www.seriouslyfish.com/species/thorichthys-meeki/