Hi all i am new to live plants but like the look they give off, however i am curious about how to keep them healthy. i've heard lots about c02 but know nothing about it. What is c02 and what is the benefits of having, i saw a package kit for 30 bucks is this about the correct price? How will i use it ? I have a 20g tank no amonia or nitrite, my plants are a variety of green and white acorus, rotalia, small amazon chain swords, some other misc plant i'm not sure what it is. The rotalia is growing great but the other plansts look so-so. Also shoul i put some sort of plant light in my tank, currently i only have what came with the tank, all help is great!!! thank you guys!!!