Gratz I like those fish. I was looking into keeping them myself,so here is a pice from a care sheet i found.
Quote:
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The Copperbanded Butterfly Fish is one of the more difficult marine fish to keep in the home aquarium and is definitely not recommended for a saltwater beginner. Only introduce one to a long established tank (6 months or more) with peaceful tank mates. If you have a new tank and it is still going through the aquarium nitrogen cycle, you can kiss this baby good bye. Copperband Butterfly Fish are very delicate and it can be very difficult to get them eating. You may need to experiment with various live foods, including brine and mysis shrimp. Some hobbyists have reported success using fresh clams on the half shell placed in the bottom of the tank to get them to start eating.
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here is the link with the rest info
Copperband Butterfly Fish - Chelmon rostratus
hope this helps good luck