This may be stupid, but other than just the tank getting dirty and having to clean out the filter and doing more water changes (enough reason by itself) how is it possible to 'overfeed' your fish? Mine never eat more than they want, and if the get hungry later they pick at anything they find on the bottom. So is it really overfeeding your fish, or is it just making you tank crappy? Because if it's just making the tank crappy then we should say that, instead of overfeeding, because that gives the impression to beginners that the fish will just eat everything and explode