they are a Nice to have thing, you don't need one but they can help reduce single cell pathogens and algae in the water. If you have everything else and need to buy something then get one. if not concentrate on skimmer, ca reactor, kalk, ect first.
Steve
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 *everything said above is just my opinion, and may or may not reflect the views of this BBS, its Operators, and its Members. If cornered on any “opinion” I post I will totally deny having ever said this in a Court of Law…Unless I am the right one*
Some strive to be perfect.... I just strive.
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