Pretty much. I just get it cracked open enough that he can get his proboscis (or whatever it's called - his "snout"
) into the shell and he goes to town. Now that I freeze them they pretty much open all the way though.
I'm not 100% convinced Cyclops-eeze will do the trick. It might, most fish love the smell of it. I know my CBB goes berserk when I feed it to my tank but it seems to me that among my fish, it's mostly just my tang and my rabbitfish who are able to vacuum it down. My butterfly seems to need to strike at something to be able to eat it. I don't know if that holds for all butterflies. I guess the thing to do though is try Cyclops, if he eats it then great. If he seems to react to it but can't eat it - then try soaking some cyclops and mysis together to see if the taste transfers. Likely, what has to happen is he has to eat some mysis by accident and then discover that he actually really likes it.
Good luck!