I have an Eheim 2080 and I think it's the worst filter ever. I have it on a little 54 gallon corner aquarium and it can't even keep it clean. Yesterday I did a 90 percent water change and let it run an hour and then did another 90 percent water change. The water looked alright after all that. The fish were fed 6 hours ago and there's still stuff floating in the water. I don't know if the dual intake makes it so there isn't enough suction or what. I guess I'm going to have to get a better cheaper filter. What a waste of 500 dollars. So much for Eheim quality. I do have an Eheim 2213 that seems to work decent, but the 2080 is by far the worst filter I've ever owned.