I have a 20 gallon tank with a sand bottom. I am currently using Aqueon30 filter which does a decent job as well as a small black sponge filter. This keeps my tank mostly clean, but are there better filters for a sandy bottom tank? I tried Marineland bio wheel filter which kept my tank beautiful for about a week before it broke. Replaced it twice and they all broke within a week. I called customer service who said the sand was getting into the turbine and wearing our the motor. The design of this filter had the turbine setting upright so the sand would settle into its space. The Aqueon filter design has the turbine setting upside down so that the sand can't settle on it. But is there a better filter? The Aqueon is ok, but doesn't keep my tank crystal clear even though I have matrix media in the filter to help grow good bacteria. My tank looks nicer now that I have included the matrix. But the Aqeuon filter be ones dirty very quickly and I have to take it apart and clean it every 1-2 weeks. Anyone who has found a better filter for a sand substrate bottom, please help!