I'm concerned with my pulsing xenia I just added to my tank. I know it has a tendency to be temperamental, but it seems it may be dying. It is shriveled and not pulsing. I've heard it likes "dirty" water, and this may be my issue. I have a 180g display, with 55g sump, 20g refugium, and recently modified two 45g trash cans into additional refugiums. I'm running a skimmer in the sump fit for a 300g tank, nitrate removing filter floss before water enters sump, two phosoban reactors with seachem denitrate, deep sand beds in all refugiums, shallow sand bed in display, lots of liverock. I also have sea grass growing in one of the 45g refugiums, it was growing in my 20g, but quickly encroached and starting killing my shaving brushes and my mangrove tree. I have star polyps, clove polyps, button polyps, goniporia, and two bubble anemones, all which are doing amazing. The tank is around 3 years old, so it is cycled. My lighting is two metal halide 400w 20,000k lights, and I have two powerheads (I forget how many gph) however, I'd say moderate flow throughout the tank. Ammonia, nitrate, and nitrite are virtually 0, salinity is slightly low right now (1.021)as I didn't mix enough reef crystals when adding the additional refugiums. I dose with Kent coral accel, Carib Sea purple up, and Aqua vitro vibrance. Tank is also stocked with around 50 assorted snails, 50 hermit crabs, cleaner shrimp, brittle star, blue lincia star, few emerald crabs, fighting conch, and sally lightfoot cleaner crew. Fish consist of a regal tang, powder blue tang, powder brown tang, sailfin tang, coral beauty angel, flame angel, two firefish gobies, two green chromis, and a royal gramma. Some reason my two percula clowns and my flame hawkfish died earlier this year. The flame hawk was a new addition, however the clowns were the first additions to the tank, along with the regal tang. Everything is doing really well right now except the xenia which has been in the tank about a week, but does not seem to be improving, any suggestions would be much appreciated!