I too love the GSP they add that punch of nice color in the tank for sure.
I have mine on a small rock, I constantly trim this rock. I have been lax these few weeks and have noticed that without trimming they are spreading on the sand bed now. They are easy to trim like this but if you only want them on one rock make sure they donot touch any other rock or they will spread there.
Good Luck
Bugsy....
