I'm starting to get algae, so I purchased 10 asterea snails 5 nassarius snails an arrow crab and 3 peppermint shrimp. I also have 2 clarkii clowns, a yellow tail damsel and a royal gramma. What would be compatible with my tank (55 gallon FOWLR) that I could have to help with the algae in the live sand or even just stir it up(inverts or fish)? Also how much sand do I need for the nassarius snails to thrive I read 4 inches and I don't think I have that much more like around 2 or 3.