I am by no means an expert, but that looks really good! I'm guessing you will definitely want more light. I had a 5g and just used a couple of CFL spiral bulbs from Home Depot and it did quite well.
I never seem to have luck with Java fern myself, no idea why, but your java moss should fluff itself back up especially if you add more light. Even a clip on lamp with a daylight CFL would help a lot.