I've said it before and I'll say it again...sometimes I think Brick and Felix are related! Brick also goes on this "eat this, eat that" phase. The only thing that stopped him from being picky is being around smaller fish that are aggressive eaters. NOTHING else worked. Now he eats a variety of foods. He plays games too...he pretends not to eat certain foods but he'll eat them as soon as I leave.
Another thing I suspect is now Felix is at a size where its not worth the effort chasing down small fish. Oscars are more ambush predators...lugging around that mass chasing around dinky meals isn't worth it.
I'm pretty lucky with Brick this way. He has no interest in eating smaller tankmates. I put my rainbow Pepper in when he was only 3 inches and have had no problems adding other smaller tankmates. (It's the larger fish he harasses or offs). He WILL chase a little when they annoy him but he doesn't spend energy on it.
