I use a hydrofarm with no problems. However, I do plan to upgrade to a herpstat.
Anyway, my hydrofarm is set to 95 and I get a 88-91 hot spot in my tubs. I put my probe directly onto the flexwatt, but not under the tub. The tub tends to trap heat around the probe and make the temperature reading inaccurate.
My ambient air is around 70-75.
I also use a ranco on/off for a different rack. I have to set that one to 105 to get a 90 hot spot.
If your temps are fine and steady, then you're all good.
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