If by "preventive" (and thank you for spelling it correctly) you mean treat your enclosures and racks regularly even when you don't have an outbreak then no, I don't do it. I do treat anything that comes into QT as being infested until proven otherwise, so the enclosures, hides, and substrate get PAM'ed the day before arrival so they have plenty of time to dry. The snake gets wiped down with paper towels soaked in Reptile Spray as soon as it is unboxed so if it does have mites I'll know immediately.
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