Join Date: Jan 2013
Location: Los Angeles, CA
I have a U3 in a 20g high, and I like it. I had a generic Marineland Eclipse3 kit that I upgraded to a Finnex LED and Fluval U3 when the ballast broke for the second time on the Eclipse3.
Tank is cleaner now, and the U3 is silent. I use the spray bar setting and have to angle it against the glass or it creates too much current. In my old setup I had a second circulation pump in the bottom opposite corner for flow, I don't need it with the U3.
Only negative is it takes a lot of room in the tank, and its not pretty. You can pull the unit away from the frame (which is attached to the tank by suction cups) to take out the filters. This is a bit clumsy so you will want to siphon around the filter quickly.
This tank is on a corner table between some sofas and with my young kids I couldn't do a hang on the back or water ends up everywhere. I don't regret the U3 at all.