Scolymia receding

[BubbaReef]

My red scolymia showed some minor signs of receding when I got him from the LFS and has slowly been receding since I purchased him about 3 months ago.

My water params are good. I change about 20% of the water weekly. I have 48 watts over about a 10 gal water column and he's at the top of the stack. I've had him at the bottom, mid point and now the top trying to get him to expand out. I just can't seem to get this guy to stop the decline.

Other species in the tank such as my Trachyphyllia Brain Coral is awesome and expands out up to 3X his size during the day...it's a mystery, any advice on what to do?

 

[seapug]

Put it in a shady, low current area and it will probably expand.

 

[Samper]

Ones that I've kept have always done extremely well very near or right on the sand....maybe at an angle with the sand and the rock. Where is yours placed at?

 

[BubbaReef]

it's currently on rock near the top of the stack. I have a lower shadier spot that has some sand available, i'll give it a shot and see how it goes. Thanks!

 

[dendro982]

I would move it away from mushrooms - 1 -1.5" distance at least, with flow from it to the mushrooms, not otherwise. If there are no space, it may be located as umbrella - partially above the mushrooms.
You may try the relatively low flow area, and away from heater.

My creature at beginning (mottled):

And after:

Looks to me similar to yours - should be quite tough.
The last resort - some carbon for a several days, shouldn't hurt anyway.