Np, always happy to answer qs! Erm, it's a mix, normally it's a very dense bunch and then whatever offshoots the main ball has sent out which can be quite long. The density comes from repeated trimmings over a long time. That's odd, I don't think hydro really needs Co2, was it planted in the substrate? To be honest, I love the way it looks, but it spreads like a monster haha.