ok so this is in a 5.5 gallon tank. I have two bags of Aqua soil amazonia and a 27W power compact 6500K light on the way. So my question is could I just use excel or diy co2 to grow this? Could I grow it immersed until it almost carpets and from then on out just add excel to keep it alive? Does this plant have to have Co2 to survive or just to carpet out because I have seen many people grow it immersed to get it to carpet faster?