I have a 20 gallon long tank for my leo. And have a 6x8"(I think) zoo med pad. No temp gauge. In the past few months of owning a Leo I have got the tank good ..hot/humid/cooler sections. Night 75 to 80 & 85 to 90...never over 95 ...during day. She is comfortable...goes back an forth from hot to cooler. Spends time in humid. Eats good. All is well. I purchased a new heat pad recently (the one I had was borrowed from the people that gave away the Leo and tank to me.) I bought a larger pad for the 20g long tank. (8x12 I think?), No temp gauge just the pad. I will add the picture of what I bought... I have a zoo med digital thermometer so. Boy did the pad work!. The tank was like 97 last night on hot side after the basking light went off! I was afraid that when I went to work today and the light came on it would roast so I put the old pad back on. I was hoping for any suggestions someone might have on me still being able to use this new pad. Eventually I want to buy a heating pad that comes with a thermometer hooked to it. But if anybody had any ideas on how I can use this... maybe stuck to the bottom on hot side but coming out the bottom and up the side of tank, so it doesn't go to middle of tank? Or leaving it so only half is attached to the bottom? Anyway thank you