Ok, better pics, it's obviously pretty bleached, and that could be an issue of it not wanting to be in stark bright light for one, and also it looks like you don't have a lot of sand for it to set in.
So mysis squirted towards it a couple times a week should bring back health and color, perhaps a cove area w/ a ledge so it can pull in and out of light as it wishes, and maybe well up sand in that area, a dsb would be best, but maybe do what you can.
I also would not put such a jagged looking piece next to it like what that coral skeleton appears in pics.
If you can't provide a ledge for cover, maybe shade screen light above it.
What lighting are you using, how long has tank been running?