Here in Hawaii, we have alot of different types of volcanic rocks and one in particular we call cinder is very light, and very pourious. It's easy to clean and it's seems to be a good candidate for bio media. Does anyone have an opinion on this? Has anyone done this before? I'm going to experiment with cinder and run water quality test, but I figure put it out there and see what people say. Thanx in advance, Aloha.
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