If I see RTN I always make a frag that is at least 1 cm away from the affect tissue and put it in a different spot in the tank. I have been able to stop RTN on established corals, but I have
never been able to stop it on new corals. In the case of new corals there isn't much you can do that I know of. STN is much easier to stop since you have a much bigger time frame.
Are you sure it is RTN and not STN? With RTN you will be able to see the skin sloughing off and it spreads rapidly, like 4-6" per day. STN is much slower so you don't usually see the skin sloughing, just peeling up at the very edge of the affected area. STN can be as slow as 1" per month or so.
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Originally Posted by Borderjumper
What and how long did you dip it in?
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Good question. I have had horrible luck/experiences with iodine-based dips. CoralRx seems to be effective and well-tolerated by all corals that I've used it on.