Fin rot?? Or aggression

[Z-Train]

I have had a sail fin tang for about a month and a half or so in my 90g. I feed him flake food and a large amount of nori every 2 -3 days he usually eats it all within an hour or so. Today I went to feed him and I noticed that the back edge of his Dorsal fin has small holes in it right on the edge of the fin as if someone poked through it with a needle many times I can't get pics cause he won't hold still. If this is fin rot I want to stop it as soon as possible. I put some nori in because I hadn't put it in in 3 days and I thought maybe he just was missing his nutrients, but he hasn't seemed to notice it. All I have in the tank is 2 clowns, 1 coral beauty angel, 1 peppermint shrimp, and the sail fin. I have noticed no aggression between any fish and the tang and the angel I bought out of a tank that they had been living in together for months with no aggression. He has good color, and doesn't seem to act any different. Pls help

 

[revsgirl]

:bump2:

 

[Otter_rs]

So he is no longer eating normally? Are the spots red at all? White anywhere? How is your water quality? What are your ammonia, nitrite, and nitrate readings? When was your last water change?


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[ReefPops]

Picture might be helpful of you can get one.

 

[cdness]

So he is no longer eating normally? Are the spots red at all? White anywhere? How is your water quality? What are your ammonia, nitrite, and nitrate readings? When was your last water change?

+1

Picture might be helpful of you can get one.

+2

Description of the symptoms without knowing the rest of the story makes it very difficult to diagnose. Pictures are worth 1000 words for these things. Also with a fin rot suspicion it could be related to nutrients in the tank...