It can be done, it's just not easy. If you want to take a crack at it, check out this post:
http://glassbox-design.com/2011/tips-for-feeding-fish/. I've used this trick and it works well
Daniella also got her CBB to fatten up and be healthy by feeding live white worms. You can search for her post or PM her.
If no one has one on here, just ask your LFS to order you one, but make sure it looks healthy before you take it because it might be an up-hill battle for a vouple of weeks.