Sad to hear about the deaths. I have had three Copperbands now, and none have died on me. Currently I just have one, and he is happy as can be in my 100g with the other fish. He is just over a year old now.
The secret, I think, is quarantine for a long time (at least 2 months), and get them feeding well on a variety of foods. I got mine trained over to dry foods, and that's mostly all my current one eats right now. Still won't eat pellet or flake food, but loves his freeze dried Mysis and Plankton foods.
Yellow Tangs are especially nasty to new fish, and that was the toughest hurdle mine had to overcome when put in the display tank. But by strengthening him on food while in quarantine, he met the challenge quite well, and adapted quickly to the big tank and his new mates.
I have a few other butterflys in the same tank, and I think they seem to give each other some comfort, and he lost his timidity pretty fast with them around.
The Copperband is definitely my favorite fish.
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