Onefish2fish, you are wrong about "red coloured" needing more lighting... Not attacking you or anything, just setting the facts straight. Reddish plants do not need higher lighting, but they do require more iron in the substrate, and are abit more in need of Co2 than green plants(not too much more)...
Better off getting Eco-complete if you intend on planting it real good, or if not maybe a few root tabs will do the trick.
Split the roots like onefish2fish said, and plant them at least 2 inches apart, so they will have space to grow.
I reccomend Dupla fertilizer. It is extremely concentrated stuff, and only needs 1 drop every three days for a 12 gallon tank. I use it on my 10G and my plants are turning up great, that is, with a few Co2 tablets too.
Hope that helps