I have a 55g that houses 2 hermit crabs, 1 shrimp, 8 oysters and 8 barnacles on one rock, 1 damsel, 1 sand sifter starfish, 1 turbo snail, 2 bumble bee snails, and about 10 lbs of live rock so far. The fish that have died are: 1 clown, 1 lawnmower blenny, 1 green Mandarin and a purple...