If competition for the bottom foods is stiff, it can be hard to make sure everyone can get some without over feeding. I break the wafers into smaller chunks (not dust!) to feed in my tanks with several fish that go for the tabs. If I feed 2 wafers, at least one goes in whole and the other gets broken up. that way, the big can claim the whole tab, and everyone else goes for the chunks.
I also do this to prevent my larger snails from claiming the whole thing.
I also do this to prevent my larger snails from claiming the whole thing.