I had two of the yellow spotted cow fish (non horned variety) and one of the blue ones you posted. The blue one was the one that got ich all over. I saw a blue one at golds about a month ago so ya, they do come through from time to time. The regular cow/box fish are quite common and I know tonnes of people buy them and a lot of them die but haven't heard about any of them nuking a tank. My last box fish was dead for a while.. like half eaten by the clean up crew.. yet no sign of any nasty chemicals.
Did you spot one scuba/snorkling or something? :-) I spotted one pretty close to the shorline just off of one of the beaches near Lahaina. Followed him for a long long time. He didn't seem to mind.
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