Hello, I use UTH's and its a pain, but it is possible to hit your temps. And I was always told its ok to have a hot and cold side so he can go were he feels comfortable. MY ten gallon tank goes 83f on the warm 80F in the middle and 78f in the cool and I let it all drop a few degrees at night but never let that cold end go under 75f. If you want to use UTH's your best bet in IMO is to use the 10-20 on the side and put a 30-40 on the back. When putting them on the side I find always go up size or it work so good, and the 30-40 wont work on the end of a ten its to big. And I built a box around 3 sides to keep the heat trapped or it just heats the room your sitting in. I have a picture in a thread were someone asked the same question, I will find it and let you know so you can look at it. Oh and I have them hooked to a dimmer that's how I lower at night.
And it is a pain in the butt Lija is right, Im looking to get another baby pacman in a couple weeks and I will be setting this one up with a CHE or lights.





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