So I got a new used rack that fits 4 41qt tubs horizontally. They are wired with 3in flexwatt with all separate plugs. The thermostat I have is a cheap petco one for now that does an ok job.I plan on getting a new one early next month. My question is is 3 inches enough to warm an adult bp? I have some older heating pads or strips (not petco or zoomed kind) that could fit under the sliding tubs that have a bigger heating surface for them. Should I continue to use the 3in? or switch to single heat strips (almost looks like flexwatt tape)? I would like to maybe change out the flexwatt that's installed now to cover 1/3 ish of the tubs but that wont be for a few more months. Please guide me bp netters! Thanks

Other info:
-Bf always complains it's too hot so he often opens the window so I can't keep a steady 70 degree room.
-Temp gauges read 78f-ish on warm side, and usually 89f on the warm