half black angel ?

[192clark]

I have had a half black angel for about two wks. He did seem very active before, cruising around nibbling at the live rock. Loved Nori really did not seem to care for formula 2 pellet. I also use a mixture of Mysis, cyclopseze, formula 1, and emerald entre all frozen.
My problem is in the last day he is a bit of a recluse hiding in the back of tank behind rock. I have also noticed that above his eyes along the top of his body he seems to have gotten thinner under his dorsal fin. From the eyes down he seems fine. Any suggestions or comments welcome.
Params
ph-8
alk 13
ca-450
NO3 10
sg-1.025

 

[triggerfan91]

If the skin around his eyes and his lateral line are eroding could possibly be HLLE, as far as the hiding, that could be just stress.

 

[192clark]

There is no erosion, just seems thin under dorsal. I thought I might try some scallop or clam as I have read where they go nuts for that.