Thinking about making the plunge into CO2. Right now I have four 40 watt T8 bulbs 19" off the substrate. I also just started dosing using the PPS method. All my plants at this point is low light stuff...moss, Java fern, Wendii's. I was just wondering if CO2 would do me any good at this point or should I wait until I get better lights? As far as lights, 2x54 T5HO is plenty for my tank?