Hey there Laurie I ran a 9X 36 W UV on my 170 and honestly i didnt see anything special about the unit. If you are wanting to try some thing get a Ozone unit that worked great for me and i loves it. i ran a 200mg red unit on mine it cleared up the water so much and helped with the algae a bit too. but it will cause Nitrates thou, since it convets Ammonia and Nitites to Nitrates fast thou. i has a hard time getting rid of my nitrates to so.....
HTH
mike
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180 starfire front, LPS, millipora
Doesn't matter how much you have been reading until you take the plunge.
You don't know as much as you think.
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