I've always liked gravel filters. If you don't have fish that like to dig in the gravel, they are perfect. It requires regular cleaning with a gravel vacuum, but again, you still need to maintain your aquarium. I was surprised at how well this filter was built. I looked at another one in the store, everything was very flimsy and the vertical tubes were flimsy and seemed fragile. I put it in a 12 x 48 60 gallon tank, basically the same size as the 55 gallon tank but a little deeper. It comes in two pieces (which come with the kit) and fits perfectly.
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