We have a 38gal nano tank... We have 2 snowflake special clowns, a randalls goby with a tiger pistol shrimp, a stripe fanged blenney, a baby blue tang, a pom pom crab, emerald crab, 7 blue leg hermits, 3 turbo snails, and 1 or 2 sand sifting snails, a ghost shrimp, a green open brain, button polyp, green crown leather, blue and rainbow ricordia, green star polyp, red zoanthid, xenia, and frogspawn. Oh yeah and blue tuxedo urchin. We seem to have lost our two peppermint shrimp over the weekend since we added the emerald crab and urchin. Afraid that if they went to molt that the pistol shrimp attacked them but our water parameters are no different. They were very active and we saw them all the time and now nothing. We have lost 2 mushrooms and a rainbow ricordia to the pistol already. Is it possible they just went in to hiding or might they be dead? Thank you for the forums and all the help they have proven to be in the journey of creating an ocean in our house.