Hello I have started a 20 gallon long salt water aquarium. I currently have 16 lbs of rock 20lbs of live sand and 2 ocellaris own fish. I’m thinking of adding 1 tail spot blenny 1 watchman golly and 1 six line wrasse. Along with a clean up crew of hermit crabs snails and a cleaner shrimp. Do you think this is overstocked?