Planted Tank Obsessed
Join Date: Jan 2008
Location: Sioux Falls, SD
In order to make the java moss grow faster you need to give it all the things that any plant would need, i.e. nutrients, light, and a carbon source. Unless you want to get into the high-tech realm, I would just be patient with the java moss and let it run its course. You can try using some natural light to help the process, but you'll have to keep a really close eye on the tank to prevent algae.
What kind of floating plants did you buy. If you can give me a name or picture and I can help you with whether or not they can be rooted in the substrate. If you want something that can be planted in the substrate as well as float on the top of the water or above the water, look for a stem plant that can be grown both submerged and emersed, e.g. Hygrophila difformis. I have heard of cases where those plants actually grew out of the water and that might give you the effect that you want.