actually no fighting, the oscar and jd are buddies and always stay together, the green terror just does what he wants, at night when my synodontis longiristrus comes out him and the jd swim together. all are between 6 and 8 months old. they've been together since they were about 1" to 2". oh yeah, 150gal tank there's also a jag in there thats about 2" and no one bothers him, he swims with the oscar a lot.