Cleans my 20 gallon aquarium pretty well. I was concerned about my young guppies and shrimp getting sucked in, but I was able to fix this by cutting pieces of plastic from a gallon water jug and gluing them in between the gaps. I tried the other two previous methods to fix these huge gaps but unfortunately they impeded the water flow too much. However, using vertical pieces of plastic on top of water gallons works great! The fish and shrimp stay outside but the water flows in easily. However, I'm sorry that US didn't fix this problem BEFORE I bought it. I was not paid for the surgery I had to perform on the skimmer and it is annoying and very poorly designed. This unit is definitely not made or powerful enough for anything over 30 gallons, so obviously small fish and crustaceans are likely to be in the same tank as this unit. So why the big gaps?! I don't even understand how, but I literally watched the bottom screen slowly let water through. It didn't come from the top of the aquarium, I sat there for ten minutes and watched it happen. Somehow the water gets into a piece of wire in the aquarium, flows down and out the other end. Very very insecure! Very disappointed
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