I got an invasion of green hair algae a while ago after adding a new coral that had some on a rock (should've scrubbed it off first but was lazy). Then had what I believe is patches of cyano show up on my rock. So today I picked up a couple small emerald crabs (happily muching on the hair algae) and a huge turbo snail. YOU GUYS - the turbo has, in just a few hours, cleaned almost an entire rock of everything! It actually went after the cyano first and devoured it! WIN! lol (He is huge, so hopefully doesn't knock corals over, but I'm amazed at how much algae he's mowing through - he's putting my other snails to shame).