Okay current solution:
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I angled the UVB so it’s not so close to his basking spot, net moved too so the UVB isn’t as close to basking. Basking temp is still good. Also the back right corner now is shadier and I put his log back in that he likes (had to take it out before due to stitches). He can go there to get away from the light and heat. He can also get closer to the UVB using his big stick in the center of the cage.
I could also push the light back and he could use the net to get closer to UVB, the stick is about 11-13 inches away from it. Is that not close enough?
Still not sure if I need to replace the bulb with a new one. Any advice on that?
Still not sure how worries I should be about the diarrhea or what exactly caused it.