Provent a mite is supposed to be the best. Make sure you follow directions to a tee. If all your snakes came from the same place, I would check them over good. Chances are they have them too. Until your provent a mite gets there, you can soak your snake in water with a drop of dawn dish soap. That will help drown some of the little buggers. Good luck.
Sent from my ADR6350 using Tapatalk 2