Flood bulbs are good if you get him outside enough. I brought my tortoise outside 4-5 times a week and I still used a mercury vapor bulb. It emits uva and uvb. I kept a ceramic heat emitter on a thermostat 24/7.
Don’t let him eat the poo. Dog poop has parasites and it could make them sick. My sulcata has had many poo incidents and has never had a problem, but it doesn’t mean it can’t happen. I pick up my dog poo daily but i do sometimes miss it. Yuck.
You can always spray down the calcium with a spray bottle. Only give a tiny amount of calcium 1-2 times each week. What does his diet look like, how often do you soak him, what are the temperatures of your tank? Is he eating, pooping and going pee?
I have heard others using baby carrot food put into a soak to help a sick tortoise. How long have you owned him? I would get rid of that sand as well. If he eats too much of it it could cause impaction.
This was my setup when Dexter was a Bebe. And then a picture of him 8 years later. I had a ceramic heat emitter set on a thermostat 24/7 and a mercury vapor bulb on 12 hours each day. Congrats and glad you found the forum!
I place him in with warm water and cover it with a tarp to keep the heat in. It stays warm for quite a long time. We’ve had this pool for a few years. I clean it and then put it in my shed after he’s done, which may be why it has lasted so long. He does climb out by himself and doesn’t bend it...