Cucumbers are great to. They eat the sand all day and all night, it passes through there body and comes out nice and white. If you consider one make sure to get the sand eating not toxic or less toxic kind. Not the filer feeding. I got one from Aquarium etc... about three years ago and it is one of the best buys I have made for my reef tank. I also have a pink spot goby that picks up sand and moves it around in his mouth and spits it out. He tends to stay in a smaller area of the tank though.
Nikki what kind are those that you have. They are the coolest looking I would like to get a pair.