The smaller one seems to be producing the perfect heat range at the moment (just a bit more spot on than the larger one). That being said...with winter coming the temps will drop a bit and the larger UTH will most likely be the one that’s spot on. All things considered (size of the tank, time of year, the test that you've done, not adding substrate yet, etc) I would suggest the larger one. Seems like a nice set up you've got started, I’m interested to see the 3D background so post some pics if you have the time!
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