i just bought a 13" african lungfish for 50 bucks the limbs were missing ripped tail,i thought it looked bad so i bought it,wouldnt atk my arow,gar,bichir,datnoid would it?il post pictures later
South American lungfish can be peaceful (depends on the fish) but from what I've read about African lungfish on this site and others is they can be quite aggressive towards other fish. In fact my Ichthyology professor had one and in a tank with cichlids and it bit them all in half!!! BUT lungfish are awesome so good luck with yours!