Jellybean chalice frag help

[georgehoughton]

So ive had this for about a month now..
showed some sign of bleaching on corner was only small so moved it under an overhang thinking it was too much light…
Now it just looks like its dying altogether.. whites getting worse and in the top right corner looks like the flesh is receading from the skeleton even though its keeping its colour..
When i spot feed it it eats which is positive but no signs of progress grown wise

Any idea what could be causing this.. alk 8.2
Nitrate 15
Phos 0.04

Everything seems stable i have some sps doing fine, other chalice seem to be doing fine and torches and stuff thriving.. unsure what the best plan of action with this is..
Any insight would be a great help as this was an expensive frag

 

[Channas]

a picture might help but a good guess is flow or light might be the culprit but there is also other things that can cause this like Fish inverts etc. But my guess is probably too much light or too much flow maybe even a combo of both