Okay so Im now in the planning stages of my up coming 180 gallon tank. I have a couple questions, first off this is going to be a 95% SPS tank. Im trying to figure out rather or not to use sand or not. Ive seen a lot of post about it but cant figure out the best way to go. My orignal plan was to not to sand so I could blast flow all over. But then the more I thought about it a lot of the fish I want are wrasses. The center peice of the tank is going to be a harlequin tusk. But I also am looking at mystery wrasse and melenarus. I know 2 of the 3 like sand. So has anyone kept any of those 3 fish in a sandless tank? Im just not wanting sand b/c ill be using 2 MP60's a MP40 and possiably a tunze wave box, unless theres a way to keep the sand down with all that flow. Thanks for any help!