A few days ago I got a flukers shield with a dimmer switch and a 100 watt bulb and tested it in my tank that had a floor of sand and was able to obtain a temp of 100 degrees with the bulb but now here is the dilemma and I had cleaned the tank out and redid the floor of it with dirt and could not reach 100 degrees and was wondering if the sand was the reason that the temp could get up to 100 or does not matter if soil or sand is used and the only other things in the tank for now is some woody vines and the only other thing bout the sand was there was no moisture in it and the dirt I am using I can see the moisture in it when looking at it from the front of the tank and wonder if moisture could be keeping the temp from going up!
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