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If it's white spots you are probably seeing the exit wounds of marine ich(crytocaryon irritans). The only proven methods for treating this condition are quarantine with copper sulfate treatment or hypo salinity. I personally prefer the copper.A fresh water dip will kill some of the parasites that are on the skin but not those embedded in the fish or in your tank on the substrate and rock. You can't use copper in a reef tank since it is lethal to invertebrates. The only way to insure your reef is free of ich is to leave it fishless for 72 days. Alternatively, you can hope for the best and if no new strains of ich are introduced to the tank for 11months the existing strain will perish. That means you can't put any new fish in since they would either be hit by the ich in the tank or possibly introduce a new strain.
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Tom
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