blackworms, a
I don't have access to those worms or live brine right now. He has gone at oyster and frozen claim so maybe I should keep feeding it that
Yes. Copperbands eat a lot. More than other fish. I'd get a lot of whatever it will eat or it won't likely get enough if not already aggressively eating. The others will probably eat the worms too if you find some also. My cbb loved worms and I mixed mysis in and phased worms out. I personally wouldn't have put it in with other fish until it was eating well and would highly advise separation if possible.Get enough food for your CBB daily, eventually you should start testing the food in the water column, how long do you have with your fish?
Copps emphasizes feeding new fish as many times as you can throughout the day, and worrying about calories first in the beginning, making the fish eat whatever it likes, the entire diet of food will be completed with the new fish time passes while the fish gains confidence little by little.