my new little Copperband Butterfly fish

[The Guy]

I've had this little guy for about a week now, the 33g long frag/ isolation tank has been his home since I got him. I know they are picky eaters so I've been watching him closely as to his eating, seems to poke around all the rocks and crevises and has pretty well cleaned up most of the tiny feather dusters. I have been putting mysis and brine shrimp in but as of yet he does not seem to interested in eating it. the cleanup crew look after anything not eaten by him or his 1 chromis tank buddy, I was advised to try him on white live worms, so I picked up a culture and put a few in for him and he seemed to eat them ok. How many of the worms should I feed to him at one time and should I use a feeding cone?