Fluidized reactors have become very popular in the last few years for reefkeeping. Historically fluidized reactors were used for biological filtration and typically filled with sand or some other inert media to promote the growth of beneficial bacteria to aid in the reduction of Ammonia to Nitrate via the Nitrogen fixation cycle. The fluidization of the media greatly increases the surface area of the media allowing for a greatly increased amount of these strains of organisms. In the reef aquarium however fluidized reactors are being used for chemical filtration instead of biological filtration.