Let me suggest using Mazuri tortoise diet. With this you can add streight calcium carbonate and nothing more. To this you can add greens but don't need to.

Did you hatch out the tortoises?

Odds are the bulb killed it. What are the temperatures under the bulb.

Are you in the US?

>>Thank you for responding...all the torts hatched in early march. I feed them grass and zoo med grassland...which is sprinkled with supplements every 3 days. The tank substrate is dry hay (for more grazing)...the hide box is filled with peat moss...and the water container is surrounded by beach pebbles which helps trim nails and keep them entertained.
>>
>>I did happen to find him under the uv bulb...not under the heat bulb.
>>
>>Hope this helps.
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Ed @ Tortoise Keepers
Trying to keep the fun in Chelonian care