I have a nice frag of yellow polyps, about 12 heads on it. When they closed up in the evening, I notice i have about 5-6 dark green shiny round bubbles, -is it bubble algae?- growing amongst the polyps. Do i remove the bubbles? Can they live side by side? If I had to choose, I would of course prefer to get the yellow polyps at thier healthiest and I could live without the green bubbles if I need to. Any tips on what I should do, and then how to do it?