I am going to support something a bit out of the ordinary for me here. If I find that my fish like a food, I use it more often in the mix of foods that I feed them. If they are not enthusiastic about a new food, they never see it again. It is not that I am some kind of expert on the subject. Rather I am a hobbyist who watches his fish. If my fish love a new food, they get it more often. If they hate it, they never see it again. With as many tanks as I have that means I still get to use most of the foods that I buy. What one kind of fish hates, another often loves.