Snakes cannot regulate their body temperature like we do, they need a temperature gradient (cool side and warm side of the tub) to regulate their body temperatures as needed. If the tub is one temperature all throughout they have no way of regulating their body temperatures no matter where in the tub they go. It is best if you invest in a heat mat along with a thermostat in order to achieve this temperature gradient. If you want to go the less expensive route I suggest buying an Ultratherm heat mat along with a Hydrofarm thermostat.
http://www.amazon.com/Hydrofarm-MTPR.../dp/B000NZZG3S
http://www.reptilebasics.com/ultratherm-heat-pads
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