Any hope of persuading a CBB to take non-mysis foods?

[Delphinus]

Since the summer I've had a copperbanded butteryfly in my tank.

I'm a *little* concerned because the *only* food it will take is mysis. Historically, any fish I've cared for that exhibited such a strict monotypic diet eventually would run into troubles. Cardinals and mandarins, in particular, I've lost due to some kind of intestinal distress.

Has anyone been able to feed their CBB's anything other than mysis? I was hoping it might develop a taste for NLS pellets since all the hoo-haw about those pellets made me think it had promise ... but so far, no-go. I don't know how hungry I can make him in order to encourage him to try other foods, without bordering on the cruel.

What about putting in a clam once in a while, just as something different for him to munch on? Only thing is I don't really want him developing a taste for clams since there are 4 tridacnids in the tank and so far he leaves them perfectly alone.

Is there any hope? He doesn't have to eat flake like the others do, I just wish I could feed something with a little variety.

Or any suggestions for other frozen foods that might be good enough to offer once in a while, besides just mysis?