I’ll be honest, I killed a few cbb before I got it right. Once I did it this way, I’ve taken 3 straight copperbands and kept them alive, and given them to friends.
You need a running QT system with no other fish competition. A sterile tank with a bubbler is no good. Once I took my eating cbbs from QT into TTM, they stopped eating. Once I put them back into my DT, it took awhile, but then they started eating again over a few days.
I honestly believe that live blackworms are the secret to keeping CBBs alive. Without competition in an environment it feels safe and comfortable, all three started eating black worms within a few days. I then transitioned to frozen blood worms and then mysis. Once you’re there, you’re golden. I’ve fattened them up for a few weeks, and then moved them into TTM and then my DT. You can buy live blackworms online and there are instructions on how to keep them alive in the fridge.
I am sick of reading threads where reefers tell each other they just “need to get lucky.” Or “watch them eat in the LFS first.” While both are somewhat true, neither is sufficient. All the cbbs that I killed were eating in the LFS and stopped once I got home.
You need to have a plan, and you need to be prepared. Or else you’ll probably have another dead CBB.
Now mine eats everything out of the water column, and even nori! I hope this helps some other reefers keep this beautiful fish!