I was at my LFS discussing my tank with a couple people who work there and they are telling me that the only thing that I need to add to my cleaning crew if I eventually want a reef tank and that I also need some stuff sturring up my sand in the bottom. I bought 1 horse shoe crab and 1 sand star that is all they had available. What else can I get and were would be a good place for me to maybe order them online?