We purchased the 3 gallon aquarium for my son's betta fish, Blowie the Scary. Blowie doesn't eat all of his food, and this filter does a great job of getting out the extra food and initial cloudiness when my son puts too much in. The filters are extremely easy to use and my 4-year old can change them himself. It's a really nice set, with easy filter maintenance and I'd recommend it. Sometimes it takes a day for the filter to clear enough out, but it's still high on my list.