I keep a moba, peacock, venustus, and a malawi trout with about 6 lower jaws and 2 upper jaw polys. They all do fine. I just made all the fish were bigger than some of my bichirs mouths. I have 2 big males that are pushing 17"+. One of the males just reached maturity and is really acting aggressive and on one hell of a growth spurt! Should work out just fine.