Is my under the tank heater too big?

[Arcapello]

I honestly think you would have been fine with the original UTH, but you might be able to get away with the one you're now stuck with (pun intended) ASSUMING you put some kind of thermostat on there ASAP. Also, just to clarify what Kaorte said, that 90^o hot spot should be on the warm side of the tank. If you understood that, feel free to disregard my clarification.

FYI, that whole cold water cracking hot glass thing... yep, it's true. I don't recommend testing it by tossing some hot water on a frosty windshield either. Just sayin'. Glass is actually not a solid, it's a super stable liquid. Like any liquid, it expands and contracts with temperature changes. When the temperature changes too fast, it cracks. Pour some hot tea over ice cubes and you'll get the same effect. And yes, I did just go full nerd.

Yeah, I got the cold side/hot side thing The cold side is 75-78, and the hot side is currently like 98, so it needs to go way down. I'm going to get a thermostat today.

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Petsmarts here sell reptitemp 500R for about $45, only $25-$25 online.

I keep water bowls over the uth only when the snake is in shed, as long as the uth is being controlled by the thermostat it's ok to do, but not until it's controlled.
Some people mist tanks, my thoughts on that are that it causes a constant up and down in humidity, not good imo.

Have you covered a good portion of the top to help hold in heat and humidity?
Do you have any over head heat?

tank sizes...
http://freshaquarium.about.com/od/aq...zesweights.htm

I haven't covered any of the top yet, I thought I'd get a thermostat, and then cover maybe 1/3 of the top on the cold side?
The humidity is only at 35% right now, but once I get the temperature right, I'll work on that. I have a large bowl of room temperature water on the cold side.
I'm not using a heat lamp, or any other form of overhead heat.
And I have an Exo Terra, and it's about 22gal, or 24"x18". It's about a foot tall. I know I shouldn't use a screen top, but in the area I live in, it's either a fish aquarium or a terrarium, so I thought if I covered maybe half of the screen it would be okay, because it also has side ventilation.