Very nice tank! It's interesting to hear that you don't fertilize or add CO2 and yet your plants look great and have no signs of algae.
What's your water change schedule? I'm guessing that has a lot to do with the plants getting their nutrients. Do you use gravel fertilizers at all?
edit: oh by the way, I really like the java fern on the right side. That's a dense clump of it! I think all you need is a a little height from the background plants and you will be in good shape.
What's your water change schedule? I'm guessing that has a lot to do with the plants getting their nutrients. Do you use gravel fertilizers at all?
edit: oh by the way, I really like the java fern on the right side. That's a dense clump of it! I think all you need is a a little height from the background plants and you will be in good shape.