I have noticed this but at some point there is a quit for some species Such as bluegill and my bass. But greens and warmouth I think would eat untill there stomach poped
My Sunfish eat a good amount but it doesnt seem like a ton to me though they are still small with the big ones only about 4 inches. Plus the 75 right below them has like 45 Mbuna's that eat like a garbage disposal.
Only if the previous worm was still hanging out of their mouths! LOL!
But seriously, not really, but you do have to balance their insatiable hunger against tank water quality.