Thanks for your comment.
Well, the tank has been up and running for a year, but it doesnt take much to make it look like that (you should look at other members tanks that go about this in a big way with high-tech setups).
The Valis at the back was pretty small at the beginning, so that took a while to grow. The java fern on the wood is slow growing too, but with both of them you can buy them in a slightly larger state, so that saves time. As the for the rest of the plants, they are all Hygrophila polysperma rosanerveg. Hyrgo grows like the bill for the london olympics, and i have to cut it back every week or two. I have used the top halves (which have little roots coming of them) to plant elsewhere to fill out the tank a bit more. They get a bit more bushy where you cut them off, and the plants have no problem growing from the new cuttings. The hygro has only been in a few weeks, but makes a world of difference.
Until recently, I just had rubbish tubes that came with my juwel tank of 1.3 watts per gallon, no ferts (apart from laterite under the sand.. you can use root tabs if you don't have this) and no Co2. I now still have 1.3 wpg, but better plant growing tubes, a bit of weekly ferts, and i have added a bit of Co2, but not up to the magic 30ppm. I think people with low light tanks get too hung up on this. If your tank can get by without Co2 as it is low light, then any addition of Co2 will be enjoyed by the plants.
I'm just starting out in the plants bit really... One step at a time.
Good luck
Squid