Copperbanded Butterfly fish are tough sometimes. Getting them to eat prepared foods is usually the biggest hurdle you will face. I got lucky with mine and it will eat frozen mysis. I've actually gotten him to eat right out of my hand. If you decide to get another make sure to have the LFS
feed the fish in front of you before you buy it. You want to see the fish active and healthy. Lethargic or over active fish are not good options. The CBB should be inqusitive and interested in you when you walk to the tank. If the LFS
feeds the fish and it actually eats the food they give buy some of that food.