Red Sea CO2 Bio System

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This item has been discontinued.

Red Sea

A natural efficient system for the production and diffusion of CO2 for aquariums up to 40 gallons. This simple and reliable system generates CO2 by a pH buffered natural fermentation process, providing an almost constant supply of CO2 for approximately one month. The CO2 is atomized and then diffused in the aquarium by a venturi pump injector. The pump`s advanced design allows it to be placed at the bottom of most tanks, utilizing the full depth of the aquarium for maximal CO2 diffusion. To prevent dangerously low pH levels, the pump can be switched off at night or connected to a timer.

Manufacturer Info

With a dedicated team of scientists and other professionals, Red Sea is widely recognized as a leading innovator and manufacturer of quality products for aquarium hobbyists. Red Sea constantly strives to provide hobbyists of all levels with highly effective solution-driven products designed to make your fish-keeping experience as enjoyable and successful as possible.

The embodiment of Red Sea’s dedication to providing solutions for today’s reef-keepers is its range of MAX-NANO, MAX-E & MAX-S aquariums- The only choice for true Plug & Play™ coral reef aquariums, now featuring the very latest in LED lighting technology.

For advanced reef-keepers the Red Sea REEFER provides a great platform into which you can add your own selection of hardware. With its ultra-clear glass, ATO built-in, silent flow valve and superb quality of finish the REEFER sets the standard for those wishing to customize. REEFER is also available as a Deluxe version with LED lighting included.

Red Sea’s unique Reef Care Program (RCP) provides a comprehensive, safe and easy to use program for testing and supplementing within reef aquaria, and is perfectly complemented by Red Sea’s Coral Pro & Red Sea Salt’s, which has become the salt of choice for those seeking the very highest quality water quality for their coral reef aquariums. Both salts are made using a unique natural process which delivers unrivalled homogeneity and is perfect for delicate corals. Check your individual bucket of salt’s composition using Red Sea’s innovative new “MyBatch” software.

Whatever your aquatic needs, Red Sea delivers high quality innovative, solution based products.



Experience Level: Intermediate


I like this product but the real issue is the same with all C02 kits like this. The amount of C02 and creating the correct balance for your tank is hard. I would suggest buying a small pressurized system if you can, NRG makes a real nice small one. But if your budget won't support that this works. I think this may be just right for a 20 gallon long. Buy C02 measuring kits though and be aware that really monitoring C02 levels is hard. Excess or deficiency levels of c02 from this can cause random algae breakouts. The pump/diffuser doesn't really seem to control output so getting a good balance in your tank is hard with this. Ultimately get this if you have a well aerated tank that is a 20g long to 40g and you don't need too much C02 such as in a 3wpg setup.

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