CO2

[Corey]

Hey all, first time posting, awsome site.
What is CO2 used for in aquariums?

[Aquattro]

Welcome to the board!! CO2 use depends on what type of aquarium. In reef, it's used to feed a Calcium reactor, in which it lowers the pH of the water in an enclosed reaction chamber and this dissolves a calcerous media. This then maintains Ca and alk levels in the tank.

[Richer]

In freshwater tanks, its used to lower high pH... and in the case of FW planted tanks, its used to provide an abundant source of carbon for plants.

-Richer