Hey everybody. I have a 400 gallon reef tank and I just got three new fish for the tank and two of them have gone missing in less than 2 weeks. I got a solar fairy wrasse, hippo tang, and fire blenny (as well as a cowrie snail). The hippo tang and fire blenny are both missing and the cowrie snail is not moving and the shell appears to have a layer of fur on it, while the wrasse is doing perfectly fine. I have also noticed 2 green chromis have gone missing but I am not sure when they disappeared. The tank has plenty of live rock and corals that have been there for years and the fish and inverts include: 3 orchid dottybacks, 1 filefish, 3 Pajama cardinals, 1 foxface rabbitfish, 1 yellow tang, a breeding pair of clownfish, 2 clams, 2 cleaner shrimp, 2 urchins, 3-4 serpent stars, and about a dozen assorted crabs and snails all under 2 inches inn length. There has recently been an outbreak of Acoel worms in the tank too, I dont know if the two are related.