Red Sea Fish Pharm ARE51010 Turbo CO2 Bio Generator Kit Plant Care Products for Aquarium Turbo CO2 bio-system provides a simple reliable and safe source of natural CO2 The turbo CO2 bio-system is recommended for aquariums up to 40-gallon This is diffused into the aquarium with a venturi pump injector that breaks up the gas into very fine bubbles Attaching the pump to a timer will allow the user to limit the output period to daylight hours The pump can be placed at the bottom of the aquarium to allow for more contact time