My wife and I are new hobbyist. Had freshwater for years, but only have had a saltwater tank for about 2 months. We have a 55 gallon tank, with 9 medium pieces of live rock, 15 hermit crabs, 3 emerald crabs, 6 turbo snails, 10 smaller snails, a spiny oyster clam, a cleaner shrimp, 2 green...