I read a comparison study of 4 fish foods....two were the Cargill's, one was AM 500...and I can't remember the forth. The AM500 outgrew the rest...one of the Cargill's was close.

Point being that if you outgrew AM 500, and another study showed AM500 outgrows the Cargill feeds...then you outgrew the Cargill feed.

Sean