The UV sterilizers and/or ozone should be kept off for the 7 days you are dosing if you are cycling, or for at least 24 hours if it is for additions of new fish or water changes. UV sterilizers and ozone filters are designed to kill and break down any living organism that passes through them, including beneficial bacteria.
Aquarium lights do not count as sterilizers. A UV sterilizer is a specialized piece of equipment that is designed specifically to kill off floating parasites, algae, and bacteria. It is extremely unlikely that you would have a UV sterilizer without knowing about it.
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