Well you're certainly not lacking in PO4. Other coral seem normal? How long as it been in the tank? Any changes in light? It was fine and now it's not opening?Sadly this zoa was my first ever coral so i didnt know about dipping. And phosphate is 0.25ppm
I would bring up my NO3 and try an iodine dip. Also be sure it's not getting too much flow. Where is the placement in the tank? Can I get a full tank shot?Tank is 3 months old. And now i think of it i dont think it never opened up since i brought it home. When i got it from the vendor it was fully opened. No changes in light and other corals/zoas are all opened