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Hello!

I have an 18 x 18 x 12 Exo Terra enclosure I got from the Facebook marketplace and I am stuck between the Fluckers 11 x 17 and 11 x 11 under tank heat mat. I think I am leaning towards the 11 x 17 (itís what I am using in each of the 20-gallon long tanks), but Iím not sure if the remaining space would be sufficient for the cool side of the tank. Which would be better? Any advice is appreciated. 😁