I think I will play it safe and treat anyway. The reason I was asking is that I have a Sailfin tang (1.5 inches) in QT now and he is very shy/not eating much for the past week. I didn't want to start treatment when he is acting like this. Since it seems possible that even without signs he can still bring it in, I will just wait until he become more comfortable in the tank and eating more regularly then I will treat with cupramine/prazi.
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