I got java moss, and I guess this thing piggy backed its way into my tank on the moss. It just grew that big in a matter of days, it was really small when I got it last week.
There is an anubias in the background there. The plant I'm talking about is the one with slender leaves.
My tank is a low light set up. Not much for ferts, fluorite gravel, but this thing isn't in the gravel.
I guess I must be doing something right because it grew so fast.