Wait until your non-waterproof fan breaks, then replace it with a waterproof one. I have one normal fan that has survived >2 years of humidity and
misting. I also have one that died literally on the first day I put it in the tank. If you're already using a 120mm fan, Noctua has a semi-industrial line than would be perfect:
Amazon.com
My fan is located in the middle of the tank pointing up. Air flows out of the fan, hits the top of the tank, then goes toward the back wall, then down along the back wall to the bottom of the tank. This way it flows in the same direction as the misters spray, rather than fighting them. I agree it would be better to turn the fan off while
misting, I want to do this once I get the irrigation control integrated with the rest of the control system.
I found a grower on youtube who appears to be having a lot of success growing in a controlled environment like we are talking about. He also uses the inkbird controllers. It's worth checking out his methods. He explains his terrarium setup in the video below:
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