Alfalfa Meal = Fishy Fatner?

#1
I went to petco today to get some hikari algae wafers for a BN I was supposed to get today, but no, my LFS couldn't get them in. So, I plopped in a half of one into my 25g for my corys, but they didn't even touch it. Every else in my tank attacked it and after two hours it was gone. Now everyone is fat in my tank. Except my corys.

The algae wafers have everything as in a normal fish food, but with alfalfa meal. Is alfalfa meal some kind of fishy drug? Should I not feed my tank until my fish poop everyhting out? Should I put it in my corys night hiding place at night?

I knew I should have gotton those shrimp pellets for the corys....