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Paul, I have also noticed this in my past reef tank. Originally I never used a qt and only started after a goldrim got real bad ich. I knew there was ich present in by tank because new tangs that were QT'd 6 weeks would be introduced and get ich from my tank indicating ich present in tank, but yet somehow all the fish in my tank for years tangs including hippo's, yellow tangs, dwarf angels never ever showed a spot. Could there be an immunity? |