for about 3 months, the only thing not doing well in my tank was my african blue xenia. it was always retracted and receding. today i found out why. after the mh's had gone off, i decided to check on the tank and both of my emerald crabs were on top of the rock and pulling off and eating the blue xenia! if anyone wants to trade for what is left of it, im open to offers, because i feel that it could come back in somebody else's tank, but it will definitely die in mine.