I actually have a 45qt tub, I did a long line of air holes on the sides of the tub. Then I also did several in the front, both top and bottom. Then realized I wasn't holding enough humidity and temp, so I had to close up the bottom air vents. And that made it much better than before. So on my next enclosure I will just be adding air holes/vents on the sides only, but that's just me though.
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