Just bought a 5gallon the otehr day to keep my injured gourami and 3 new fry in. Once the gourami gets better and the fry grow large enough to go back in my 20 gallon, I'll start setting this up as a slightly larger nano aquarium. lol
gasteriaphile: Try adding more water so it touches the bottom of the filter output. Less surface disturbance = more CO2 for the plants. Maybe get better lighting too, but first just raise the water level a bit.