HELP! My hatchling Sulcata (African Spur-Thighed) toroise is suffering from MBD!!! (calcium deficiency)?

Suds, by itty bitty hatchling sulcata has recently decided to scare me half to death by aquiring Metabolic Bone Disease. I know how to fight it; lots of sunshine for Vitamin D, and lots of calcium. But the trouble is, he doesn't have the appetite of a typical hatchling, so he doesn't eat much of the calcium-powdered foods I offer. I've tried giving him bright, good-smelling, and tasty food with doses of calcium powder, like so many breeders and books suggest, but even those don't entice him. He's obviously eating when I'm not around (I'm at school most of the time), because he's not wasting away... but he's also obviously not getting enough calcium! It's really worrying me, and I'd be grateful for any helpful suggestions any fellow tortoise keeper would mind sharing...