This is another option for mite control. Essentially, it cuts any insect trying to get in or out of your cultures and kills them. But, it can be eaten by humans and other pets. 100% safe!
Food Grade Diatomaceous Earth 908g / 32oz. | DiatomaceousEarth.ca
This is how I have mine set up and have been using it for years.
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The rack.
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Cheers!