Yesterday I noticed my Xenia was gone. It didn't slowly die and it didn't get knocked off, I can still see the base of it there, I think so anyways. I'm assuming my Emerald Crab ate it, or at least destroyed it. I have seen him pull at a zoa or two, but then he left it alone, I always presumed a case of mistaken identify as he was eating algae around them at the time. I saw my Xenia at least 2 days ago so it was something recently. The tank is starting to get slim on algae, so maybe he's looking for alternative food sources? Maybe it's time to start supplemental feeding for him.

Any idea what else could have happened?