Could someone please help me identify the purple polyps in the photo. They were not intentionally added to the tank.
Is this a type of xenia or star polyp? Are they invasive?
What about sympodium? Grows similar to gsp like a matting sort of thing I have some blue green sympodium in my tank. Here’s a pic open and closed as I conveniently just fragged some and it’s closed up still. It lifts off very easily and if not desired anything that might get left behind cover with some epoxy or something.