I had a quarantine tank and the blue tang was in it together with a pygmy angel. Something was wrong, however, and after 24 hrs I found them both lying on the bottom gasping for breath. I decided to try to save those two at the risk of my other two fish getting sick (and in the belief that healthy fish would fight it off). It was a choice between the certain death of the fish in the quarantine tank vesus the possible illness of the two in the main tank. I chose the former, not realizing that I was forever jeapordizing the system.
I'm still uncertain why you insist that if the ich is not manifest for a long period, it's not gone.
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Aryeh
Life is too short to learn everything from experience.
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