Marsilea doesn't really need much light, so I think it should be fine. What I'm going to do with my 10 gal for lighting is get a incandescent hood and throw in 2 CFL bulbs in there, probably 27 watts each. And for substrate, use Soil Master Select, Shultz Aquatic Soil, Oil Dri, and maybe some other cheap ones. They work well for budget substrates(I'm using oil dri). And not sure about filtration, but I use a aqua tec 10.