RHPs are fine for 12'' enclosures. it's just easier to achieve a proper heat gradient using belly heat given the height. either approach is just a matter of preference. for future reference, you might want to look into RBI heat panels as they are designed to eliminate the off-gassing issue. if you run yours unregulated for a few hours, they should be fine. I would also hook up your thermostat and let it run for 12-24 hours at the desires temperature. either way, don't introduce your animals until the heat source is regulated by a thermostat.
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