My experience is make sure u see it eating first before u buy it.
The guy I got mine from said “oh he’s eating pellets that’s all I feed!” That fish didn’t once go for pellets….
Make sure u have plenty of food options for him to try.
Mine didn’t eat for first week almost. All he was doing was trying to eat my snails: nassarius and conches
Heavy feeding got him to finally eat. He eats mysis, brine, and nothing else I feed he will eat.
I don’t have much experience with cbb but he was one of the first into my tank in order for him to establish himself. He was very skittish at first.