*HELP* Acanthophyllia not looking happy

[208Reefer]

I have 2 acanthophyllias, one looks very happy and the other doesn’t. I moved the unhappy one because it started losing color around the mouth so I was worried it was getting too much light. It’s been a few days since I moved it but now it’s not eating and the mouth is open from time to time. Upon further examination and doing an iodine dip I saw something in its mouth (not sure what it is though) can anyone help or have suggestions?

 

[vetteguy53081]

May be getting irritated by sand. Elevate just slightly. Moderate light and water flow and feed 3-4x per week
Salinity 1.025
Temp 77-79
Nitrate < .6
Mag 1300
Kh. 8-11