This is a discussion on Cleaning air stones that have been in sick tanks? within the Beginner Freshwater Aquarium forums, part of the Freshwater Fish and Aquariums category; -->
Just wondering, what's some ways to sterilize an air stone that has been in a quarantine/sick tank?
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Provided no medications were used then it is safe to use straight away.
If medications are used then a dip in a mix of water and bleach solution will kill off anything left. Make sure though you let it dry off completely and then rinse it again in water, this will allow time for the harmful chemicals to vent off.