I don't keep large South American cichlids (oh, one acara), but for the firemouth, liveaquaria says:
Quote:
Ideal tank mates include similar sized: New World Cichlids, Loaches, some "Oddball fish" (miscellaneous fish), Plecos, and scavenger Catfish.
|
Remember, these fish will get big and will eat anything that fits in their mouths (and that they can catch).
You can go with a pleco and larger loaches safely.