Quote Originally Posted by Raidynn View Post
The thermostat probe is just beneath the surface of the substrate if it's not on top.
Not all the way at the bottom of the substrate? Just little bit under? You should get a temp gun or a probe thermometer and check the temp right on top of the substrate to see where your at. If its just beneath set at 90 your temp on top of substrate could be a little low, it might not be but you won't know until you check with one of the temp devices I mentioned. That way you can be reassured the temps are perfect. They sell acurite thermometers with probes at Walmart for $12 and you can put the probe on top of substrate on hot side and run the wire under the substrate and set the whole unit on the cold side and it will give you the cool side temp and humidity also.