I like to treat my fish with egg whites now and then, but is it possible to give them too much? I don't know the nutritional content of egg whites. Also, would it be okay to put tiny bits of sinking granule into the egg whites to add nutritional value? Or would the fish choke? (I feed my egg whites by boiling them and cutting bits of the white into suitable pieces.)

Egg whites are pretty healthy for us. Not all the bad stuff in them as in the yolks.
I think as a treat once or twice a week would be good. Do they like them??

They love them and the egg pieces are so easy to keep track of, so I know what fish ate how much ^^