If you did a mite check and found two or more mites, treatment with a miticide is on the agenda. The miticide of choice is formic acid. Either Formic Pro or Mite Away Qwik Strips (MAQS). They both use formic acid as their active ingredient. The applications are a little different from each other.
Follow the directions on the label. Don't use expired strips. Expired strips delivery system gets compromised from age and using expired strips may injure your colony,
Best to treat a colony before doing a divide. Do not treat a weak colony with formic acid.
MAQS application video
Formic Pro Application video: