My Miami hurricane chalice is receding! Help

[Jonathan blackwood]

So recently on one side, my chalice is dying... why I don't know. Nothing is around it to kill or sting or bother it. No fish in tank to nip at it. And I checked all my parameters at the LFS and he said the only thing out of range was my ph, which I now have corrected... it still hasn't stopped receding. .. I don't know why. All other side and ares are growing amazingly and colorful. Just one side all the sudden after 8 months of nothing wrong, it now has a issue.

 

[Jonathan blackwood]

Pic 1

 

[Jonathan blackwood]

Pic 2

 

[LBehr]

If you fixed pH I would be patient and try spot feeding closest mouths to recession. I got a chalice colony that had a hermit eat a chunk off and it grew back pretty quick after I started intentionally feeding that area.

 

[LBehr]

Also sweet colony hope she bounces back