I would also say I have a shallow sand bed. It varies from 1" to over 4 inches deep depending on the sand dwellers. I have a couple of critters that seem to do a great job of stirring up the sand.
A dragon goby lives under the rocks and is constantly moving sand around. He sucks it up in his mouth and blows it out from under the rocks creating large mounds. When I clean the inside of the glass I purposely level the mounds and he starts again from scratch!
I also have a cat's eye snail that moves around under the sand. Sometimes he surfaces and climbs the side of the tank, takes a peek out of the water and then heads back down under the sand. I had not seen him for weeks, and assumed he had died but he resurfaced last week alive and well!
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