This 21st century approach to grow macro-algae has revolutionized the aquarium industry. Featuring a central LED light with an external heat-sink this algae scrubber is an all in one refugium. It is the most efficient way to remove phosphates and nitrates from a saltwater aquarium. A 300 gallon per hour pump (sold separately) is required to circulate water through the Pax Bellum. Available quick disconnects are sold separately.