It really depends on the size and type of your enclosure, as well as the room temperature. If it is a fish tank around 20 gallons, then generally no, you should not need a UTH on the cool side. I have a 20g with a 7" (approx) UTH on one side and its fine. I also have a melamine enclosure that I built and for that I have an 11" flexwatt strip and a 30g-rated UTH both on one side. What is it that you have?








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