Buy a tube of horse dewormer Ivermectin paste from a feed store. It should run $2-7 a tube. Give a rice grain sized dose to all of your juvi and adult rats.
That should take care of fleas and mites. Any rat that is a feeder, don't bother with treatment. Separate and QT your feeders and just feed them off.
And be aware that nursing babies will be treated through mom's milk. So don't feed those off for at least 3 weeks.
Or spread food grade Diatomaceous Earth around the rat racks, in the bedding, and on the rats themselves. Its non toxic and all natural. Safe for mammals. It kills anything with an exoskeleton. And if ingested, it acts as a dewormer as well.
(Not to be confused with pool filter Diatomaceous Earth)
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