Mine took awhile to grow from a small frag to this, and the length of all the polyps seemed to be smaller until I increased the light. But now all new growth is long polyps within a matter of weeks from sprouting.
New T5 setup:
Lower light PC's:
Here is the growing edge, you can see the quick transition to long polyps very quick. It is spreading incredibly fast.
My GSP gets as much lighyt as I can throw at it. It can't get enough. I I think the really long GSP are found under lots of light. They ahve always been bright green though... With either light..
Lol, here is how they started
I am now about to frag, they have almost grown to the bottom of that branch, at least 5-7 inches below the first pic.