I have this 2" oscar that I bought at a wal-mart. I was told there they were feeding him 'small cichlid staple pellets' so that's what I got. Well, after 2 days of him not touching the stuff I tried some flake food from my daughters tank...and he loooooves the flakes. He's been on flakes for about 3 weeks now and won't touch the pellets. The thing is he is getting skinny and I know is because he needs 'heavier' foods, I just don't know which kind. Any advice?? Thanks a bunch!