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redgold54

Beneficial bacteria and UV sterilizer

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I have a Sunsun 304B canister filter with a 9uv light on a 110 gallon tank. Do uv lights affect (kill off) beneficial bacteria?

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It can, but with 9w, it's doubtful.

There have been reports, and warnings, that newly established cycled tanks should hold off on the UV for a period of time.

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My tank has been established since October/November. I'm fearful of turning the uv on lol

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I think you're alright lol

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