I will vouch for Kenya spreading like wildfire. I started with one stock and now have over 50. Mine have stuck towards the bottom of the tank so I don't mind too much. My GSP and xenia are not fast spreaders at all, actually have a hard time growing them. But I'm an anomaly I think as most tanks I've seen with them they are everywhere like a weed. Rubbed band or a mesh is a good technique to get it to attach.

