Ok, so the stuff is growing really, really well. Loads of side shoots jutting out nearly horizontal, densely leafed, and creeping along the gravel horizontally which I'm reading it does under high light? What the what?! I guess the sun is responsible because it's surely not a single t8 doing this. All of the new growth is pretty green, though. Just a bit of pink in the highest tips. The whole plant was pinkish when I put it in so I know it isn't the green kind. Do I need to supplement iron or is the pinking all about light?