A 300 gallon tank? Which brand/model UV sterilizer do you have? How much flow through it? How is it plumbed in? How old is the bulb? I'm not saying it is the problem, but it's curious the Tang has Ich a month after being added - that's a long time after. How long was he in quarantine? What treatment/protocols did he receive or was it just observation? I'm not sure if the Tang carried Ich all along or if he got it from the tank.
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Originally Posted by Aquattro
I agree with both views  Leaving it is easier, and may be fine. The hard way is, well, harder |
Agreed.
If the other fish are in good health and unaffected, I would take a hard look at the UV sterilizer, plump up the feeding, add some garlic and/or an "Ich food".
I make a homemade mash. One of the handy things about this is that I can thaw it, mash some medications into it, and re-freeze it. Many medications are MUCH more useful if they can be ingested. I've fed these into my reef before, and haven't had any trouble - YMMV.