I've been looking around online and asking around at my LFS and have been striking out on getting an ID. It came in on some GSP and I didn't catch it before it took root and has absolutely exploded since. It seems like it almost sends runners out and has been coming up in other spots in the sand. I remove as much as I can manually but don't really seem to be making any ground. When I pull the stuff out of the sand it comes up with almost like a root structure that brings some sand with it. And it is very stuck to the rocks where it has grown on to them. Any help would be greatly appreciated. Thanks!

