I can see it, it looks like a hard urate, which is the 'pee" part of the poop, could have been stuck in there and caused a part of the impaction. What substrate do you have him on now? Is it solid, as it should be to prevent him licking anything loose as they do lick all the time in their tanks. And getting the T8 into the tank is a great idea. It's a Reptisun, right? Really good tube for him. Did you call the vet about it, the picture turned out fine, you should send it to them so they can see what it is, and figure out a way to get him to pass it.
I'm glad you're getting Tracie's probiotic, she makes it herself and it's wonderful. My Imp, who's just over a year old, had alot of trouble when I brought him home from the pet shop last January and that helps him digest really well, so that will help your boy, too. Critical care is really good, you can add the bee pollen into the critical care, add some water and feed it to him, he'll probably like it better because it's sweet. I add butternut squash to the critical care, as well as bee pollen, add water and mix it well with a whisk, I also add Carnivore Care to add more protein, even though mine do eat their bugs. Hornworms are great for him because not only protein, but calcium and lots of water. Baths every day will help keep him
hydrated while on the meds.
You're doing everything right and I'm sure, once he's off the meds and that stuff is passed, he'll feel much better, poor guy. I'm glad you brought him home!
Keep us updated, k?