03-03-2010, 11:04 AM
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Nothing in my experience will eat dead plant matter; you either leave it (if not excessive of course) to naturally decompose and provide food for the plants and bacteria, or you remove it.
As for uneaten food, this is an issue as the food will fungus before it can decompose. There are two ways to solve this problem. One is to feed less; if food is falling to the bottom noticeably, too much is being fed. But some still will with only top feeders, I have had this myself. The solution to that is a group of bottom feeders. I have Corydoras and Whiptail cats in my 115g, Corydoras and Farlowella cats in my 90g, and loaches in my 70g. I never see uneaten food. I used to in tanks without these fish, and sometimes in tanks with them (a sign of my feeding too much).
Before adding more fish, how large is this tank? One has to be careful not to overextend the biological balance with too many fish, or worse problems than some fungused food will occur.