Planted Tank VIP
Join Date: Jul 2002
Location: Victoria,British Columbia, Canada
I have absolutely no CO2 injected into any of my tanks.
My plants are growing, rapidly, and I have very little "Die off" accept with finely leaved ferns (Indian Fern/water sprite). So While I do aggree that injecting CO2 into a tank will improve the growth rate of the plants, I do not agree that it is necessary.
The trick for me has been keeping the CO2 that is naturally produced in the water. I've been able to achieve this by using reduced flow rates in my tanks. My 22 Gallon planted tank is using an aquaclear mini, and thats it. There is not much surface agitation but there is more then enough area for biological and mechanic filtration to occur. The plants themselves are doing much of the filtration already, the Filter is just keeping the water moving.
In my 45 Gallon tank it is completely overrun with Wysteria, Java Fern and Java Moss. Addmittadly these are easy to grow, however I see growth rates of 1-2 inches ever few days on the wysteria. I am pruning the stuff back every week. This tank is using an Aquaclear 500 (overkill for this tank, but it works). The Wysteria has grown a canopy around the surface of the water keeping it relatively calm, keeping much of the CO2 where it is needed.
You can grow plants in a tank without CO2, but you need to find the plants that work for you tank conditions. Just be patient, experiment and things will work for you.