as long as everything is consistant you can use just one. ie. same size cages, same brand and size heat pad, same location of your cages. if this is all true then there shouldnt be much difference between the temps in each cage.
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0.1 CB 2005 Normal Ball Python @ 2.5' /415g
Grey Boaphile 221D, Exoterra Lg Desert UTH, 2 Lg ESU hide boxes, Ranco digital thermostat, 18" fluorescent light, Lg water bowl, 60# indented paper as substrate

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