Looking great. I would surely get a brighter light. whats the width of the tank, maybe I can help show some links?
Everyone I talk to says you need to push at least 4
WPG, but it also depends on what lighting you go with. Metal Halides have better depth penetration, but on a Nano, it's kind of an over expense. I would go with Power Compact and save the money, but still getting enough light. If it was a 55g or bigger, it would be a different story.