From what I have read you will not need both as long as your room Temps do not drop extremely low.
My question to you is how exactly are you planning on modifying the cage divider so that you can fit one rhp and make it heat both sides? I ask because I have thought about doing something similar but most rhp manufacturers recommend that no tank surface should be really close to the panel. I believe the reason for that was that it can overheat the internal components of the panel. I know it's not a huge surface maybe a 1/2 inch width of pvc going across the panel but I'm thinking will it be enough to overheat the panel? Or even cause it to malfunction? Let me know your plan and thoughts on it.
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