...approx. 2 years. Approx. a year and a half.
With cricket food.
...Miner-All.
* Fecal Description - Very waterier and dark brown recently we feed him a Goliath worm and it came out intact. No he has not been tested for parasites
* Lighting - we use a 18 inch. ZOO MED 10.0 UVB light that is about 11" away on the top of the cage.
90 degrees on top (basking spot) and the floor is 80. Lowest overnight temp is about 68. The way we measure these temps is with a thermostat....
Howdy,
Just a little follow-up while on your way tothe Vet's

:
To be clear, you've had him for about 1.5 yrs?
What
kind of cricket food do you feed your crickets?
As was asked; what is your dusting schedule? Which version of
Miner-All do you use?
Yellow-top or
Red-top can? Miner-All products are fine but you need to be using the yellow-top if he spends most of his time indoors under artificial UVB. It has vitamin D3 in it and the the red-top does not. Also, add Herptivite (vitamins) once or twice a month. If you were only using the red-top can then he was not receiving any supplemented vitamin D3 and that could be a big issue

.
As was mentioned, parasites are always a possibility so a fecal check (~$25) is important even if it is just to get a baseline for future reference. If coccidia is found then I'd say you have a smoking gun. Treat with Ponazuril. Having an undigested feeder come out could be caused by a number of things. If the feeder was in there a few days then the digestive system is shut down. If it passed through, undigested, in a day or so then other issues may be at play. Lack of calcium has been linked to digestive problems.
The ZooMed 10.0 18" linear tube (~
1.5 yr-old tube? [replace at 6-12 months

]) positioned 11" from his
basking spot and going through the screen will be close enough to a useable Reptisun 5.0 at this point as to not be a
smoking gun for your symptoms.
You mentioned thermostat. I hope you meant thermometer. A thermostat implies that you might be trying to regulate the temps via controlling the basking light output through the thermostat. This isn't a recommended method to control basking temps for chameleons.
Gotta dash to work!