Hey gang. I'm a noob, and I'm trying live plants for the first time. I had (still do, it has shrimp in it now) a 10 gal for a couple of years with artificial plants and upgraded to a 46gal. bowfront. Most of my plants are turning brown, yellow, anything but green. I am not using Co2. My light is a 65 w (10000K ?) that is on for 10-12 hours a day. I havea lace fern, some plants with leaves like teardrops, a couple of anacharis that I purchased as med light plants. Do I really need the CO2 ? I don't need the plants to go crazy, but I would like them to look decent. I'd appreciate any help you can offer. Thanx.