you can also try this approach.
https://youtu.be/8htR9pTO0Tk
I know Walter (ReefPilot) has some video on how to train your CB to eat. Just do a search on Reef Pilot's posts. I think he used some PVC and poke a bunch of holes that only fits the CB snout. Then place the chopped shrimps or clams inside the PVC. This will prevent other fishes and inverts on eating his food.
Good Luck.