Hello

i have a 20g long with a zoo med uth on the hot side and a smaller uth in the cool side both ran off lamp dimmers. Now the temps are 80 on the cool side and 91 on the warm side with the probed under aspen bedding and on top of reptiles carpet.but in the middle of the cage it is significantly cooler and i have the screen top taped off. So my question is is it OK for it to b cooler in the middle if it still has two spots to go to that are good temps