After having a few fish die from not eating, I now ask the LFS to feed the tank the fish I want is in, if the fish I want eats I buy it. If it's not eating and it's a rarer fish (like my blue ring angel) I ask the store to hold it for me until the fish is eating, if it's a fairly common fish I'll wait until I find one that's already eating.
When I was at one of the LFS that had several CBB's I asked them to feed the tank. Much to my pleasent surprise four of them were eating mysis. So I ended up buying one that was arleady eating. Much easier then going through the stress of it not eating and wondering if it ever will.
I go pick up my Blue Ring Angel tomorrow at the LFS. They held it for me for the last 2 weeks, and now that it's eating I am happy to pick it up.
Nothing like spending a lot of money on a fish that doesn't eat, much easier and less stressful to check first. Glad your CBB is eating
I'd wait a week then add him back into the main tank.