loose stool/no urate

hi we just got this cutie from a friend that cannot take care of him anymore, we got him a couple days ago (i have a vet appt on monday dw) he has had 2 healthy looking poops with us so far, but the most recent one was very loose/liquidy and there was no urate... (i was at work when he pooped so i didnt see what it looked like fresh) i gave him a hornworm bc i know no urate can mean dehydration and again i have a vet appt in 3 days but i just was wondering in the meantime if anyone had any suggestions (i believe the bit of red in the poo is bell pepper skin but please correct me if i seem to be wrong)

btw this is my friends setup i am buying a 120gal today after work for the boy🥰

his salad with us has been dandelion greens, endive, red bell pepper, and a little topper of parsley and lemongrass so far, but he seems real excited to try new stuff! he has also had a plethora of dubias, two hornworms, and maybe like 3 superworms (gutloaded and calcium dusted for all these guys)

he has been in what i believe to be a 40gal tank with paper towel as substrate, no water available and just a bar light, however again i am getting a 120gal with actual substrate and whatnot today, and i fixed his lighting to a similar setup ive got with my other beardie!

any tips/info/speculation would be greatly appreciated!