i love mine, all it does all day long is clean my sand. plus it also gets into places i cant get into. but i have 125 lbs of rock in my 57 now if you have minimum rockwork you can always clean the sand yourself, but why would i want to. no member of a cuc is the end of be all when it comes to maintenance, they wherent meant to do all the work, but i try to get as diverse cuc as possible to help maintain my tank