Let me first answer this question first, NO over feeding will not kill your fish, fish when satisfied stop picking feed. A fish feed pellets has Abt 10mins floating and non disintegration ability but will disintegrate gradually when not eaten which will lead to ammonia accumulation in the pond, high ammonia kills fish. Another thing is that u are wasting ur feed. This is one challenge faced by Farmers. Not knowing how to feed is a serious issue. In this class we will learn feed management.