I've never really had an aptasia outbreak,but have had some come in on Rock that was bought here locally. I can't remember the dosage but as I work industrial and we have sodium hydroxide about,I brought some home and mixed it up and nailed those little bastrds with a needle. IME it killed them stone cold dead and they didn't come back! I have used it on rock inside and outside of the tank. No ill effects were seen in the tank as well. Although I did it before I did my WC.
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