Hello and a warm welcome to GU.
Some suggestions:
1. Your temperatures are a little bit too low, eventually this could lead to your Leo not eating as Leo's need warmth to digest their food. Will post recommend temperatures soon.
2. As JIMI stated, you need three hides, a warm dry hide where your Leo can keep warm and digest their food, a warm moist hide where your Leo can stay hydrated and it aids your Leo with shedding, a cool dry hide where your Leo can go to cool down.
3. There are many conflicting opinions regarding housing Leo's together. I wouldn't risk it, there is always that chance that you will find one Leo severely injured. There are also many signs that you may not recognise of one Leo bullying the other. One Leo will always be more dominant than the other. They may be sleeping in the same hide, this is down to instinct and they will sacrifice certain things (keeping their whole body warm) just so that they feel secure. You also do not know who's poop is who's , making it hard to tell that they are both pooping regularly and that they are healthy poops.
4. I'd recommend removing that substrate and replacing it with a solid substrate such as textured tiles or paper towels!
Temperatures
Recommended temperatures for all leos regardless of size
88-93 F (31-34 C) ground temp at warm end inside the warm dry hide
no greater than 85 F (29.5 C) air temp - 4 inches above ground on the warm end
no greater than 75 F (24.5 C) air temp - 4 inches above ground on the cool end
Leave the UTH on 24/7. Turn off the overhead lighting/heating at night (~12 hours on and ~12 hours off) unless ambient room temperatures are particularly cool during the night.
Moist Hide
Homemade Humid Hide recommended by GU's Conched (Matt)
1. I use 45 oz Country Crock containers; the 16 oz are too small. The lid has a 6 inch diameter. The 45 oz size allows a fully grown Leo to fit inside comfortably.
2. Cut an entry hole about 2.5 inches above the container's base.
3. Add 2 inches of sphagnum moss to that hide.
4. Keep moss or paper towels damp 24/7.
5. Use the lid of the container as the ceiling.
6. Locate the moist hide on the warm end of the enclosure.
7. Warm moist hides 24/7 help leopard geckos stay hydrated so that they shed completely by themselves. Even when not shedding you will find your leo inside.