what are some nive tropical plants that would make a nice tropical theme? I know nothing about plant species, and i am only $4 away from my shiny new lights, so its time to get some knowledge. I want to go for a more bright tropical theme, not hte calm planted tanks you usually see, somehitng more exiting, with a "bright" look too it. I also have black snad, but i have pure white sand i can switch over too if that would be better.