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Uv Light - Yes Or No

daveg6529

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Joined
Feb 21, 2013
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London, England
Looking at items available in my LFS I found a submersible UL light & from the look of it I assume it goes in the main tank.
my questions are -
Would one be an asset to my tank & why?
What does it do?
Where should I place it should I buy one?
I have a 240Ltr tank with Tetras.
 

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