I agree with dave you shouldn't need to run both in a 4ft viv, the gradiant should be pretty much spot on, mine are, with a bit of tweeking from the warm side, don't forget a guard on the ceramic
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Where do you have the CHE,like how far from the side of the viv?
And Another thing bought two hides that are 16.5x10.5x4, are those big enough for my 5 ft 5kg bci or should i go bigger ?
Sorry if my english is not that good but Im italian