Whenever I add new fish that get picked on I put a divider in the middle of my tank and keep my current fish on one side and the new fish on the other. After a few days things always seem to be OK. I had a copperband butterfly get picked on almost to death by my tang. Put in a divider for 3 days and when I took it out they were fine. However not everybody's tank is able to be divided. Like it has been said an acclimation box might also work. How big is your tank? That could also be an issue
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