I've had a yellow clown/coral goby for about 3 months. He's always done great and was the friendliest fish in the tank. Last night before bed I checked on everyone with the tank lights out and he was sleeping in his regular spot on a fake anemone. This morning he was gone! Completely gone with no trace. I looked everywhere. The only unusual thing I noticed was my chocolate chip starfish had a yellow substance around his mouth (please see pics). Other tank inhabitants that I'm aware of are 3 red tipped and 2 blue legged hermit crabs, a peppermint and coral banded shrimp, a firefish, 3 narcissus snails, a turbo snail, some asterina starfish, amphipods, a sponge, mushroom coral, brain coral, mini anemone/feather duster things, 2 kinds of macro algae, coralline algae, and of course live rock. A couple months ago I added a guppy that I'd acclimated to saltwater to the tank. I kept an eye on him for about 15 min and he was doing great. I turned off the light and left the room. I came back to check on him an hour later and he had been pulled into a hole in a live rock and something had chewed up his head. (This was before the starfish was in the tank). Do you think the starfish is the culprit this time or something hiding in the live rock? If there's something in my live rock what do I do about it? This piece of LR has a beautiful sponge growing on it which I don't want to kill. Any ideas? I don't want to lose anyone else. 
Thank you!
Thank you!
