Grass grass grass

[cyrus]

So my 240g is up and running and I am already running into walls I have previously managed to avoid. Minor aptasia that I don't yet consider a threat and the all mighty never in my tanks before hair algae! My back wall has a 2'x2' span that popped up almost overnight. Now while it looks pretty wafting in the gentle flow of the tank, it needs to GO! I know if I scrape it off it will come right back and it is also on the rocks. What eats it? Lawnmower Blennies? Sea Hares? I would like reccomendations on the best plan of attack.