The problem with adding a CBB to a display is getting them to compete for food even tho they were eating in the store. I recently added a second to my tank so I have a pair. I keep them alone for a while to make sure they are eating well and also to put on weight as some come in thin. When adding to the tank I used a reptile carrier with holes burned
in it as an acclimation box. I would feed the acclimation box first. The CBB would get food and the tangs and other fish would come up and try to get food and did get some that came out of the holes. The CBB was able to get food without actual competition but all the other fish trying to get food gave the impression they were competing. I think this really helped the new guy to go after food when it was released in to the DT. Neither of mine will eat pellet or flake food.
The box
And whe when I removed the lid
I think the biggest mistake people make with a sensitive fish like CBB is just adding them to the DT and expecting them to compete for food. Sometime it works but often it doesn't