Koran with eroding face, Help!

Hens4Fish

Active member
Hi all,
I need help with my Koran. I have had him for about 4 months in my 75 gal. fish only tank. Other fish I have are harlequin tusk, powder brown, and blue snapper. His face is eroding away. I am not sure if it is lateral line, but it is progressing fast. Previously I had a 6" french angel that lived for about a year and never had a problem, also none of the other fish have any signs. The tank has about 150 lb of LR, with a rena filter. All other parameters are fine. Could it be stray voltage? Or a lack of some vitamin? His diet is dry seaweed, brine shrimp, krill, and clam. Please advise with any knowledge. He is changing into adult colors and I don't want his face gone. Can it be reversed? Please advise.
 
I am not yet able to figure out how to post pics on-line. I will try, but in the mean time, I will read the artice. Thanks,
 
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