I used to use bio max and then got on this kick of trying out all this "new fancy stuff". I replaced it with a mix of Marine Pure Cermedia, Sera Siporax, and Bio Home. The conclusion I came up with..... It's a waste of money lol. I believe most of us tend to use far more media than necessary to begin with, so the large surface area on these medias becomes redundant. And in my opinion, media that claims denitrification is B.S. (at least as far as being able to see a difference with your typical at home test kit.)