you're gonna need at least a 100W infrared heat bulb to get your temps up. that's what i'm running in my 55G tank but I do have to raise the lamp up off the screen at bit to keep it at about 90-93 on the hot side. my hot side runs 95, middle of tank is 85 and cool side hide is 81-82.
I also forgot to mention that I have the back and sides insulated with foam boards and the top screen is covered except for where the lamp is at.
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