thanks so much everyone.
Daza: go and get some first layer laterite from your LFS, rince it thoroughly and mix with your gravel before you do anything else. it will make a huge difference whatever you plan to do with the tank (and a massive pain to do it later on).
as to the CO2, light wont effect PH, just algae /plant growth. if your going to have 2.5WPG or more (haven't added it up) you WILL need at least a diy CO2 kit. if you wait and see what happens by just adding light you'll almost definatly have an algae problem. (unless the light is under 2 WPG)
Hondour: thanks for the comment. i'd let it spread for a month then have a major prune (but keep up weekly 25% water changes) and fertalise if needed. i left mine for about a month when i first planted and only trimmed stems/leaves rising above the surface. definatly the way to go.
Gill. i'd love to but kinda got my hands full with pruning my own. thanks for the comments and let me know if you need any help
nice sig. damn cartoon changed my life forever that did. Ha Ha
Edited:
Tokis-Phoenix: oops oversight, thanks for the compliments.