I have a 29 gallon tank that got a case of the green water after I did some maintenance of it's 2213. I tried water changes and other things and nothing seemed to work. After reading about a cheap UV filter on petsmart I figured that I would try it. Here are the before and after pictures. The after pic was taken right after a water change so that water was just a bit cloudy. The glass should of been cleaned a little too. In person it looks great though (my picture taking skills are kinda bleh too)! I think the 40 dollar investment was well worth it
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