They are great for breeding/hospital aquariums or any size aquarium depending on the needs of your fish. I have this filter as the only filter in 2 of my grow tanks and I use one as an extra filter in my 55, the water quality stays great. If you're looking for something small that's easy to hide, this is NOT your filter, otherwise this (or several of them) should suit your needs (and more importantly, the needs of your fish).
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