StuG said:+1 on the shrimp.
Perfect addition to a 10 if you're looking for a cleaner-upper. They don't add much to the bio-load.
Of course the other thing to consider if you are having a problem with a lot of debris on your substrate is that maybe you are overfeeding a bit, and backing off on that may help the situation.
You didn't really say how big of a problem it is or why you want a bottom cleaner, but just throwing that out there.