I have somthing in my 75 gallon reef that is causing all sorts of trouble. Recently corals have been eaten or picked at (green slimer frag, purple monti, green monti, nepthea, frogspawn). I have also mysteriously lost a 6 line wrasse about a month ago (I added it and saw it the day i put it in and the day after but not since then) and last saterday i added a pink bar goby which is doing great with his pistol shrimp buddy and a yellow head jawfish. I only saw the Jawfish the moment I put it in the tank and then and i went into the rock and i havent seen it since. Its oviously not levels because the corals are being picked at or moved and none of my fish pick at any. My livestock is one true perc, two cromis, pinkbar goby, 2 banggai cardinalfish, royal gramma, cleaner shrimp, peperment shrimp, pistol shrimp, astera snails, trouchus snails, cerith snails, and a few nassaris (they have been dissapering too). I got rid of all my hermits in my tank and corals have still been picked at. A while back i put in three emeralds but i havent seen any in at least six months (i had some nitrate, nitrite and a little ammonia then). There was also this ugly kinda, fuzzy crab with red eyes that ws in there but i caught him a couple months ago and threw him in the sump but then about a two ago i thought i saw him back in the tank but not since then. Is there a way he could have gone over the seperators in the sump to the pump and into the tank? I have no idea what to do or even what it is. ANy help would be very much apreciated, Thanks!!!