Best sand sifter for sand bed

[Gordon H]

We have two in our tank and they are unbelievable. They work from morning till night cleaning and sifting the top 1/2 inch of sand all around the tank. They have moved a fair bit of sand from one end of the tank to the other, but never onto the rocks or corals. We previously had a problem with Red Slime algae. Not anymore. These gobies really are the hardest workers in the tank - and their fun to watch too!