Can you tell me about the set up?
Temps and how measured?
Have you had a fecal done?
I suspect that the Leo may have a Parsite issue. The white you are seeing is the Urates, but when we see loose stools that can indicate a virus or parasites. The normal temps should be 82*F-86*F. The Leos actually do not need an over head heat source, but just the under the tank heater for warmth as they sense heat from underneath. They are nocturnal, so day light sometimes will throw them off.
As far as D3, you need to be cautious because it can cause neurological issues if too much is ingested. I prefer plain calcium in the dish in the tank. At this point, I suggest a fecal and the Herp Vet visit, as this may be coccidia which is a protozoan parasite and can cause the loose stools. I would be happy to locate a Herp vet for you with a State.
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