UTH certainly are effective in a smaller tank anyway. I've been forced to keep my cresteds in a room I can't raise over 55 degrees. Heat bulbs wouldn't have worked, as I have juveniles in small tanks. The geckos seem to nestle down over the UTH during the day to sleep, and behave normally over night. My largest tanks are 20 H, with a large UTH. Perhaps orienting this tank vertically, which would provide better for a crested anyway, would raise the temps of the lower part of the tank nicely. Cresteds could do fine, in my experience, in 63 degrees if they have a way to warm up.
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1.1 Ghost corns, 1.1 Butter het. stripe corns, 0.1 normal corn
1.1 Tremper Albino Leopard Geckos
1.0 Super dalmation crested, 1.1 Pinstripe crested, 2.1.1 Misc crested
1.0 Ghost Bull, 0.1 Snow bull

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