Ok, so I recently got a BP in November, so I am fairly new. I've been reading many tricks, advice, caresheet, etc., but I just don't know how to keep the ambient temp of the tank between 78~92 without a heat lamp.
my UTH is currently set to 100 (with paper towels on top, it's 90 degrees on hot) and my cold side is always between 74~76 degrees, and the ambient temp on hot is always around 78 degrees.

Any advice? Thank you.