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The chunks are larger than regular aquarium gravel. Ceramic medium is lighter than regular gravel, and a little sharper. It is a ceramic material covered with air pockets. Biorb aquariums are set up with a central air column that produces a current up the center of the spherical (or cylindrical) tank, down the sides, through the filter medium, through the charcoal/mechanical filter, and back up the central column. The air pockets increase the surface on which can live nitrifying bacteria that process fish waste in aquarium water.
This aquarium filter medium from Reef One is designed for and sold with the BiOrb series of aquariums. I am happy with it, although Amazon is not the cheapest place to get it. It works like an under-gravel filter. Plants seem to anchor in it just fine, although I bought extra media both to increase the biological filtration and to increase the depth of anchoring material for plants.
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