The Marine Conversion Kit eliminates the complexity of recreating your biOrb or biUbe into a tropical enviornment. Not only has the kit finally made conversion easier than ever, it also provides a step by step manual on how to set up & convert your biOrb or biUbe. Comes with all you need to set up a marine environment in your aquarium: replica live rock, hydrometer, marine cartridge, salt pack 500g and easy plant package