I only have 3 bubbles of the stuff, but they have grown pretty big. They are about the size of a small marble. When they were smaller, I purchased 2 emerald crabs, they didn't eat the algae, so I added 2 more. The bubble algae is still there. I tried to pull them off the rock, but it seems like it will pop rather than pull off the rock. If that happens, I understand that my problem will only get worse. 2 of the bubbles are kind of embedded into some deep cracks. I am not sure if I should just leave them there or what. The good part is they are starting to get encrusted in choraline, and are becoming camaflagued in purple. I guess, if it isn't a problem I will just leave them there.