Wanted to hack my Marina Slim HOB so I don't have to buy their filter cartridges. New to the hobby, any advice as to filter medium to replace the cartridges with? This
i25 Internal Filter | Pets At Home
Amazon.com: Marina Slim Filter Carbon Plus Ceramic Cartridge, (3 Pack) , 3 Cartridges each : Everything Else
How to adjust a Marina Slim Filter Flow Rate - YouTube
Marina Slim Mini Power Filter - up to 19 L (5 US Gal) - La niche&moi