dont think 2.1wpg is low light.. You jumped into the medium for sure.
Can go for green rotala, ludwigia repens, hornwort, pennywort (can be made to look as if its a stem) anacharis, giant hygro, compact hygro, bacopas.
Question, if I am in medium light............I have a DIY light setup with 3 40 Watt T12's in the fixture. I can pull one out if that would be better for my low light plants....should I do that?
I am getting an automatic pressurized CO2 system around Xmas along with some flourite and ferts to go pro but in the meantime should I reduce my wattage for the health of my plants?
Or does my 2.1 wpg give me more options along with running a low light setup without CO2 and ferts?
Must understand this that low light plants can grow and will grow better at higher conditions. So what you can do is try out them plants with your light, keep the light on around 10hrs a day, see how it goes with algae. If you see algae (like bba) then decrease the photoperiod to 8hrs a day.
Another thing you can do is get Flourish Excel, so for the next few months you can dose that on your tank as a "substitute" for co2 gas. (but still works best if used together)
Yes, From what I have read plants need to also, just like fish.
N-P-K is a good start and make sure you dose on a recommended schedule for your size tank or you could have some bad algae problem.