Their tank is 20 gallons long and high. They are both females. I dip their mealworms in calcium with d3 every time they are fed, them lightly shake some of it off. That is the only calcium/supplements i use. The temperature is air temperature and i have a ZooMed thermometer. They do have an undertank heater, which is on the warm side. What is a UTH? And sorry about not having pics again but i am not currently at home.
Can you check the ground temp under the warm dry hide with Zoo Med's probe?
UTH = under tank heat mat
I use zoomed repticalcium with d3. It isn't a liquid. I roll the mealworms around in there. The thing on her mouth isn't really there anymore. I guess it probably wasn't mouth rot, but ill keep a close eye on her.
Perhaps the mouth skin was leftover from a shed? I could not see it in your photo.
Zoo Med D3 Repti Calcium is great! That's usually what I use. It's got the lowest amount of D3 of any similar product on the market. That's a good thing.
I would
ONLY use that D3 calcium at most 2x per week and maybe not on every worm even then. Have you checked the directions? However, that also depends upon the diet you feed the mealworms 24/7. I recommend Zoo Med's Natural
Adult Bearded Dragon Food as the mealworm diet with collards (high calcium, low phosphorus) in a shallow dish off to one side. GU leo keepers report great success with that. (I rarely feed mealworms.) If you feed the mealworms that, cut back lightly dusted D3 worms to 1x per week.
Add
Zoo Med's no D3 (plain) Reptivite multivitamins 2x per month (just a wee amount) when used along with that particular adult beardie food.