I had good luck with my old emeralds eating hair algae. saltwaterfish.com has them 5 for 15.99 right now.

I just picked a good size one(not as big as jims though) up at Aquatek for $8 yesterday. I got two or three bubbles of bubble algae, and they are said to do good with that too, although, I kinda like it, but dont want an outbreak.