Originally Posted by Christople
Is Co2 necessary because I guess I could get one going but it might not be. With My 38 and all the fish in my signature would I need Co2?
No. But, it depends upon what you want from your plants in the area of growth.
Plants have differing needs with respect to light and nutrients. Some do very well in low light with minimal nutrients (Java Fern, Anubias, etc), some in low light with more nutrients (crypts, etc), some with moderate light and nutrients (Vallisneria, Sagittaria, some stem plants, etc), some with moderate light and more nutrients (Echinodorus, other stem plants), some with higher light and nutrients (yet other stem plants)... you get the picture.
The first decision is what you want in your aquarium. If your goal is to grow high-light stem plants, have them flower, etc., you will need more light and higher nutrient levels, including CO2 diffusion. If your goal is to have a healthy planted tank with the minimum of "extras" such as my tanks in the photos, minimal light and minimal nutrients (and no CO2 diffusion) will achieve good plant growth.
In a couple of previous posts in this thread I mentioned the balance that is essential. Won't repeat.