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None, they're all filthy poop machines, awesome none the less, baby bristle noses with clean glass to an extent.. I keep mine purely because I like the way the look and act..
If you're talking about cleaning leftover food, then you can have scavengers.
Cory's and shrimps do a good job in scavenging.
(remember that cory's do best in a group of 6 or more)
If you're talking about algae, then pleco's or algae eaters would be good.But most pleco's grow real big right?
I've read somewhere that most livebearers also eat algae
Or you might consider having a planted tank to avoid the growth of algae.
Goodluck on your tank!