having fed Doug's CBB while tank-sitting - his also chases down frozen and prepared food sent into flow like all the other fish. I actually put the first and only PH in my tank to duplicate what he has going, and like it much better than when I used to cut all flow during feeding.
That being said, in my main tank I have never seen a CBB, chromis or perc eat: flake, pellet or those formula-x gel cubes so my sucess with the CBB is the same as with all my fish - they all eat mysis and blended seafood.