I've added these to my 55g freshwater aquarium because they are all the rage at the moment. I also have an Aquaclear 70 HOB filter. I had an air stone in there anyway, so why not add some sponges. The sponges work great, they can be removed and cleaned, and Chinese algae eaters rest on them. I haven't had a fish death in the 1 year past either, I'm guessing it was old age. 5 Stars. I will always keep one in my aquariums.
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