I'm Using previous version of rack with 3 inches tape - belly heat(now Rich put 4inch) and sometimes during winter i need to crank up it a little ... I more concerned about humidity .. I have divider in one tub where I keep pair of black house snakes..
Even with that amount of holes when i had them on cypress with 4 OZ plastic cup as water bow.. I had tube steamed.. and as You Know High humidity cold be even worse than low....
Buy yourself Accurite Thermometer with probe and Humidity reading... You can control temp in 2 points of tube and of course humidity as well...
I have one in each tub where I keep my balls.. is like 10$ on-line and sometimes Lowes and Home depot carry them too...
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