This is a sponge filter. Yes. Like everyone else. But they are very well made. High quality, comfortable sponges, beautiful and heavy base. Not cheap plastic at all. They are as small as I hoped my nano aquariums would be. I use two in a 5.5 gallon tank with a divider in the middle. One filter per page. I will definitely be buying more as I will be replenishing my collection with small tanks. I use small cymbals with baffles for my Betta collection.
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