Thank you for providing such a detailed response! I will try to organize this in a better way.
Sexing Leopard Geckos
Leopard geckos become sexable at about 6 months old. Males can be distinguished from females by a distinct v-shaped row of pores and by bulges right under the vent.
•Click:
Sexing Leopard Geckos
•What are the sexes?
Enclosure
Your tank is suitable for about one gecko, although another could be squeezed in assuming it has the appropriate number of hides. I would really reccomend separation especially because your little guy is not looking too good. Here are my recomendations;
•Add more hides, the minimum is three per gecko, a DRY cool hide, a DRY warm hide, a MOIST warm hide
•You can make hides out of old margarine containers, it really looks like they need a moist hide, it will help with shedding and hopefully stop the stuck shed on their toes
OR
•Temporarily section off a part of the tank with everything your ill "male" gecko needs until he is better
OR
•Get a new setup for one gecko in order to separate them and avoid any fighting issues as well as providing a better place for your gecko to possibly recover
Heat
Your tank doesn't need an UTH on both sides.
You need a warm and a cool side gradient, for one side of the tank use a 11 x 17 inch Fluker's or Ultratherm UTH. The dome your light is assumably in should be above the warm side although you don't want to use an infared bulb, it is very disruptive. Instead use a standard incandescent bulb, 15 watts is suitable. You want a thermostat for the UTH as well as the light, I use and reccomend this model;
•
https://www.amazon.com/MTPRTC-Controller-Thermostat-Germination-Reptiles/dp/B000NZZG3S
Here's a temperature guide for all leopard geckos as measured with the probe of a digital thermometer (and controlled by a thermostat set at 91*F/32.8*C):
•88-92 F (31.1-33.3 C)
ground temperature right underneath a leo's warm dry hide
•no greater than 82ish F (27.8ish C)
air temperature - 4 inches above ground on the warm end
•no greater than 75 F (23.9 C)
air temperature - 4 inches above ground on the cool end
Suppliments & Gutloading
Are you saying you
gutload your insects with Repashy's Calcium Plus or you
dust them with it? You should always gutload your insects, simply putting your mealworms in a container with some ground up grains and some fresh fruits and veggies will suffice. Gutloading with a suppliment will do you nothing or could overdose your geckos. Have you been dusting the worms?
See:
http://www.geckosunlimited.com/comm...mo-video-4-jan-2013-update-11.html#post434916
Mealworms aren't the best of staples either, can you pick up some Dubia Roaches or Crickets? Feed the staple twice a week and mealworms once, your gecko could be impacted due to improper temperatures and excess mealworms. Dust with Repashy's Calcium Plus 3 times a week.
Breeding
If they are opposite gender, they are probably breeding and the female is stressed, but at the moment one seems utterly unresponsive. As a caution, make sure to pay attention to the gender.
•Opposite gender = Breeding
•Males = Fighting
•Female = Possible fighting
Treatment
You need to amend your husbandry as above, I can provide feeding schedules if you would like. Your gecko sounds like the husbandry issues have slowly caused your gecko to go downhill. He may have deficiancies in nutrition if he has been only fed mealworms. I would first reccomend you get him his own little quaratine setup whether that be a new setup or sectioned off part of his tank.
Then see if you can book an emergency vet trip, he does not look good.
In the meantime you can try some of the assist foods and baths to get the shed off as well as hydrating him. Whilst in the bath you can try a little massage on his belly in case he is having trouble moving his bowels. The quaratined area will help you identify his poops and keep him safe from the cage mate.
I would move him a little far away from the heat mat so the temperatures are moderate since it looks like he is barely moving and cannot pick temperatures as needed. It may be a good option to collect a fecal sample for your vet, if you would like instructions I can provide you with them.
Vets:
Association of Reptilian and Amphibian Veterinarians | ARAV Membership
I can't tell you for sure what this is, but he needs to see a vet soon, before it is too late. Praying he makes a recovery. ♡