I have seen ich appear in systems where there was absolutely no additions for months. Fish like the powder brown tang are just susceptible to it.
I think Nori is an excellent idea. Keep him as fat as you can.
I agree with reefwreck 100%
You could also try feeding him some spectrum medicated pellets.. just make sure he eats them all and they done land on the corals. Tricky to do perhaps.
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Matt.
Current Tank Info: 53x32.5x26 190g dt 60g of sumps 3 tank-100 gal frag system 6xAI prime 8xt5. 4x maxspect gyre. Skimz Dual internal sicce pump skimmer Deltec PF601s ca rx+Kalk stirrer
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