I purchased 2 of these. I have 2 75 gallon tanks. I wanted to add these along with my Marineland Penguin 350. They are very noisy. Spend the few extra bucks and go with the Marineland. If you don't want the bio wheel, leave it out. I should have spent the extra few bucks and went with all 350's. I tried everything to quiet them down. They are just loud and obnoxious. But, if loud means nothing to you, the large bio bags they come with are really nice. It allows you to remove the charcoal media and either insert something else or leave it out. It also comes with extra pieces of down tube to reach the bottom of those tall tanks. If it was quiet, 5 stars. But the noise kills it for me.