Our next aquatic deal from Aquarium Supply is a Calcium Reactor that can handle an aquarium of up to 500 gallons! For the expert coral keeper, a calcium reactor is a must-have. This high-tech device will work to keep your calcium at the level of the ocean, so your coral and other calcium-utilizing animals will thrive. This reactor will work manually or automatically, depending on the additional components you are currently using on your aquarium. A self-priming pump is included. Give your coral the calcium they need to look their best. This is the ultimate reactor for the job. If you would like to buy this Calcium Reactor for your aquarium just click the picture!