I have Oscars that will not put up with anything.If they can move it,they do.I also have a Green Terror in a lowlight planted 55g by himself.He won't put up with any other fish,(i tried putting him with the O's,he did not like them)but does not mind the plants.There is wisteria,vals,and rotala,that are planted,and java ferns in the driftwood.I think it has more to do with the particular personality of the fish,more than what species it is,IMO.I have a friend who has Oscars in a lowlight planted tank without any issues at all,go figure!Oscars are supposed to be the worst fish to keep plants with.