Does anyone know why this coral is dying?

[msavoy]

I’ve had this coral for probably 3 months now and I began to notice about a month ago that it’s starting to recede. All my water parameters are within range so I’m not sure what could be the issue. I should also mention that all my other corals are doing fine. Thanks for any advice.

 

[T-J]

All my water parameters are within range ...

Please list what they are. Also, what kind of light/flow is it getting? How old is the tank?

 

[Manny D. Mandarin]

Listing your levels will be extremely helpful in allowing us to narrow down the possible causes for you. Based upon the growth on the skirt it looks like it was receding but it now growing as normal. Was there anything close to it to sting it or did that part get buried in the sand?