Under tank heaters in all forms are the devil. hahahahahahahaha. In my humble opinion, monitors sense temps, what they seem to be looking for is an areas of temps, a mass. Not a spot. Heat strips/pads etc, are X temp at the pad, then quickly drop every 1/2 inch. There is no mass temp, there are only very local temps.

My feeling is, they are looking for a certain size area, I have no handle on this, other then its large. My feeling a large area is required to keep the eggs steady over a long period of time. This areas have sun or heat exposure because they normally go through several seasons and at times overwinter. These areas must also drain, that is, water or moisture cannot sit still(have no place to go. This fact is one reason to use deeper then needed substrate. So excess moisture drains below the depth needed. Cheers and good luck, oh take pics of baby bluespots hatching.

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