Hagen Fluval Fluval Underwater Filter U-Series Aquarium Internal Filters at Pet Mountain

On August 16, 2011:
I was struggling with cloudy, dirty water for the longest time in my 20 gallon tank. I did not obey the "overfilter" rule. I installed this and within 48 hours the water was crystal clear.

On August 9, 2011:
I currently have the U1 and U2 and plan to get the U4 for my bigger tank. And I must say, this is my favorite filter on the market. I not only love the filtering job it does for my turtle tanks, but I love all the features that other filters lack. For example, you can change where the clean water comes out and how hard it comes out, you can take the filter out of the tank without removing those pesky suction cups, and I really like how it looks overall.( Please note, U1 model only has foam, and doesn't have some of the features that U2 U3 and U4 have.) It may be kind of expensive, but you get a great deal here on Petmountain.