In my opinion, if you get these fish you have to be prepared to quarantine them and to feed live blackworms, live brine (not good long term), frozen mysis (Hikari) and spirulina-enriched brine, and chopped scallop, shrimp and clam from your grocery store. In many (probably most) cases, you are going to have to provide 2-4 feedings per day of live blackworms and live brine, and then transition the fish to frozen mysis and brine and chopped seafood by adding some in with the live foods it is eating. You have to be prepared to feed live blackworms for a year or more before the fish eats enough other foods.
My cbb's preferred food is a seafood mix I make up and freeze (scallop, shrimp, clam and salmon), followed by mysis. Initially, it preferred live blackworms but I quit feeding them after a year as I transitioned the fish to other foods.
In your DT, feed something the cbb won't eat (e.g., flakes or pellets) to fill the other fish somewhat, and then feed the food the cbb eats so it gets enough to eat.