buy a sand sifting goby, he will keep your sand perfectly white and clean, he will eat everything up, then after that, he wont allow anything else to build up on the sand, if you look at my tank pictures and click the one of my clam, you can see how dirty my sand was, then click the picture of the goby, both pics were takin in the same spot of the tank, i just moved the clam becuase goby was dropping sand on him, but you can see the amazing job he does cleaning.