Mine really didn't help my algae problem one bit, due to it's size I guess, and I didn't like the look of it on my 29 gal. tank. The light I had over it would spill over into my tank. I ended up getting rid of it and bought a better skimmer and I'm doing more frequent water changes. My water quality is better now. The one plus to the thing was all the pods I had in my tank, my chaeto was full of life.