Sorry if it has been said already, but easiest way to keep your sand clean is with an orange spot sleeper goby. They are tireless workers, (and interesting to watch, too) and their constant sand sifting ensures that any detritus is taken away by the water column and out through your overflows.
I lost mine a few months ago (they will find the smallest hole in your tank top) and tried going without for now (I wanted to try some bottom LPS corals). So I got a tiger tail cuc instead. However, he spends most of his time in the rocks and has failed to keep the algae from starting up on my sand. I am planning to get another goby, as I have had about enough of this algae.
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