I've been looking through a few journals and stuff including George's 'Little Mountain'. If I remember right, he stopped injecting CO2 some way into the aquascape, with plants like HC, Blyxa Japonica, Staurogyne sp. and Pogostemon helferi but still doesed ferts and easycarbo, obviously. So my question is - is it possible to grow these plants without CO2 injection? I know it is possible with Pogostemon, but the rest?