<h2>Two Little Fishies - CDX Carbon Dioxide Absorption Media</h2><p>Sometimes its the carbon dioxide that accumulates in the air in closed buildings thats wont let the pH of your aquarium stay up&#046; </p><p>We have the solution its call cdx a carbon dioxide absorption system&#046; </p><p>Simply put CDX media in our Phosban React and connect to air intake of protien skimmer with our cdx adaptors&#046; </p><p>750ml last 6&#045;8 weeks average o 50&#045;100gal reef aquarium&#046; </p><ul><li>3 L</li></ul>