UV steralizer? Is it neccasery?

[reef rico]

Is a uv steralizer benaficial or is it a disadvantage to have.
What good and bad does it do to a reef tank with heavily stocked sps , lps and softies for a 33gallon tank?

[gummi]

I've never had one but I've done a lot of research. My research shows that they do make a difference. But spend the money and get a good one like the Pentair Step one.

[lizardarm]

I've read that they can also kill beneficial critters along with the bad stuff. But they do make your water shinier.

[kdblove_99]

They can kill good and bad but to me the bad out weigh the good so i ahve used one for 2 yrs now!