02-12-2020, 06:53 PM
Join Date: Apr 2005
Location: Brentwood, CA, USA
iTrader Positive Rating: 100%
| | Re: New to planted tank, need quick advice on Co2 and water movement!
Consider that CO2 in water is dissolved into the water, just as any other substance that dissolves is. The water can't maintain much of a gradient of concentration of anything dissolved in it. That alone gets CO2 spread throughout the water - water with high CO2 concentration quickly loses the CO2 to an area that has low CO2. That is because CO2 dissolves in water very, very easily. It is probably impossible to actually measure the CO2 concentration of different areas of the tank, but theoretically the differences would have to be small. Good water circulation should be more of an issue for keeping good dissolved oxygen in all areas of the tank.