Emeralds never got rid of mine. I ended up taking each rock out during a water change and manually removing each bubble I saw from the rock. I then rinsed in the old water and put back in the tank. After all was done, I loaded the new water. It hasn't been back since and been over 2 months. Instead, I have had an explosion of hair algae now, go figure but I had a little of that before, so I think there was just nothing left to compete with it since I got all the bubble out...