PAX BELLUM N24 This innovative algae reactor provides reef keepers with the ultimate tool to export nutrients and maintain nitrate and phosphate at levels required for vigorous SPS coral growth. The ARID is a work of art and it’s patented design is based on more than a decade of research and development. As an option, you can order a Ca Reactor Feed/Injection Assembly to send excess CO2 from your calcium reactor right into the ARID, which further benefits the growth of macro algae. Light Tube Assembly should be replaced after 10-12 months. Learn more behind the chemistry of the Pax Bellum ARID, plus more here. Specifications: Recommended System Size: 120-250 gallons Recommended Flow Rate: 180-250 gph Recommended Pump: Maxijet 1200 or Mag Drive 5 (pump not included) Total Height: 22.6″; Total Footprint: 9.5″ x 8.25″ 3/4″ FNPT inlet/outlet ports