I don't know what the cool end temp is. It's still a little guy, not fully grown . The tank is 18in high by 18 wide by 36 length. I got a deal on it on craigslist for $25 including climbing tree and rock like feeders. It has a non-digital thermometer for now, it gets down to about 76 air temp 4inches above the uth side in the cool mornings right now. In the heat wave in the day it got up to 90. He gets light from the window, it's far enough that it doesn't shine directly on the tank, but he'd know it was daytime or night time. He eats A LOT. I put 10 small crickets and 4 meal worms in there and he ate them all, the next day I put 6 more meal worms and he ate them all too. I'm looking into how much to feed him next.
How about pictures of him?
Circle/analog thermometers can be very inaccurate :-(.
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. Can turn off overhead heating at night.
Check the temps midday when the UTH has reached it's max.
Feed daily with all he can eat in about 20 minutes.
How are you supplementing with calcium with D3 and multivitamins?
Have you checked out the Leo caresheet linked right in my signature?