I would def change out that LED light as soon as you can. It doesn't grow plants. I emailed tetra and they told me its not powerful enough. The light I'm using currently is an archaea 27w twin power compact. Go to Adana-usa.com. It's about $70. With the plants you have it will grow plans perfectly. Are you using an enriched substrate? I'm using a dirt substrate with Eco-complete cap. Read through my thread and you can find more info. Good start!
Ahh, I'm still loving your tank. I just looked at this thread again, and I wanted to say that the light that came with the tank is not so bad. Here's my tank with the stock lighting and a bit of supplementing with a desk lamp. I'm surprised it grew in so well.