Ok i have tested everything my params are as followsCould you post other parameters as well? Alkalinity is a very important factor in keeping healthy euphyllia/fimbriaphyllia, and if it drops lower than about 8 dKH, you’ll see a significant drop in polyp extension.
What does your water change process look like? Do you disturb the sandbed a lot? I ask because the water in the picture looks rather cloudy.
Ammonia .25
Nitrite 0 nitrate under 5 ppm
Ph 7.8
Dkh 9
Phos between 0 and .25
Mag 630 probably the issue
Calc 460