I posted this link before, this is a article written by Karen Randall, that gives you a good expalinantion of planted tanks,a must read before starting a planted tank, enjoy.
http://www.thekrib.com/Plants/balance-randall.html
By no means are my tanks even remotely close to Charlie's. BUT without posts like this & others from him all I'd be growing would be algae. Just look at the pics of Charlie's plants! I hope one day to have close to his success'. Read his posts for for a chance to succeed...