I have a yellow head goby in my 50g tank and hes does a great job! Initially, I bought the mated pair but one jumped and met its demise. The two were a bit too much for my setup, but with one it's quite ideal. It keeps the sand white and it does not disperse it all over the rockwork - it's very tidy. At first, he was extremely shy and after about a month - just when I began to regret it, it lost its shyness and it now parades itself all over the tank.
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