I am all about the inverts- We have 2-3 smaller fighting conchs in the big tank. They are pretty cool, but I am not sure how much they really stir the sand in the 210g. We had a really cool Florida fighting conch from John at reef cleaners (sponsor's plug). He was big 2-3 inches, but he accidentally got wegded up between two rocks facing upward and was dead by the time I noticed. :(

We do have some nassarius snails but I agree they don't do that much sand stirring wise. Our true hard workers are the cucumber (looks like a black turd in the tank ), sand sifting star fish, and the diamond goby. Obviously they don't do so good for smaller tanks and the goby can be a jumper. We stir the sand line up by the glass each time we do a water change also. - Mike (& Kristy)

I recently put a small sand sifting cucumber (yellow pee looking) in the small 2og hex, which has been doing a good job cleaning the sand and rocks near the sand. - Mike (& Kristy)