Make sure you don't put him back in the DT for atleast 2 months and that's if hes the only fish, if theres other fish in the DT its pointless he will catch it again if he is stressed and all the moving from tank to tank will be a big stress factor.I have lost a lot of fish in the past and I've tried hypo and I've tried just keeping them In the DT and they diddent work for me, I think I'm going to try and put the yellow tang in the QT and use cupramine. Has anyone used cupramine?