I have Amazon swords and bacopa caroliniana, I may get some some anubias and cryptos or java fern. I currently have a 20 watt CFL bulb 6500k, I don't know if this is enough, the plants seem to be doing fine, but hardly growing, well I only had them for 2 weeks now. Should I upgrade to medium lighting? Or this cfl is enough? I have access to T8's , Leds or Cfl bulbs, I don't know what medium lighting is. My tank is 15 gallon.