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· Premium Member
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Yes, if you get one big enough. The whole idea is that the water has to be exposed to the light for a long enough duration for the nasties to die. So... that usually means that you get one large enough with slow enough flow for the water to pass through and kill the diseases. I have a 36 watt on my 125g tank. It is rated for a pond of 500g for controlling green water. Algae is easier to kill than bacteria and such.

Remember it help the already infected fish just the water born germs will be killed.
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