Mantis Bio Filter

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This product comes in two different varieties- blocks and spheres. A ceramic material that provides an open flow and a huge surface area to promote the growth of helpful bacteria i n your tank. It's efficiency in comparison with it's size is unmatched by any other bio-filtration media on the market- and the micro porous surface means that two blocks have a surface area of a whopping 2160 square inches! Wow! Works in sumps, external filters, trickle filters or even directly in the tank! Show more