Aquarium carbon is necessary for the removal of toxic organic substances, odor and discoloration from your tank. At Bulk Reef Supply, we carry three types of our own BRS Bulk aquarium carbon products: ROX 0.8, Lignite Carbon and Bituminous Carbon. We also stock activated carbon from E.S.V., Korallen-Zucht, Eheim, Two Little Fishies and Fauna Marin.