I have a medical-grade UTH on one side of my tank, connected to a rheostat, similar to your setup. As long as there is some difference between the hot and cold sides (my hot side is around 87 or so, and the cool side is slightly warmer than ambient (usually around 70), they can choose any spot in between. Just be sure to provide hiding spots all around so they can pick their temperature.
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1.1.2 Python regius
0.0.1 Eunectes notaeus
0.0.1 Lampropeltis spp.
1.3.0 Triturus karelinii
1.3.0 Taricha granulosa
5.0.0 Ambystoma mexicanum
0.3.0 Ambystoma jeffersonianum
0.0.2 Ambystoma laterale
0.0.2 Ambystoma mavortium
0.0.3 Salamandra salamandra
0.0.1 Tylototriton verrucosus

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• UTH rheostat enough of a thermal grad? - zimbu, Thu Aug 31 14:26:37 2006
• RE: UTH rheostat enough of a thermal g - Kaysie, Fri Sep 1 08:51:55 2006