Hi, this may sound like a stupid question, but how do you tell whether a candy cane coral is opened or closed? Is it when the sweepers are out? And does it mean anything when they open their mouths. Also, do green star polyps spread from touching the glass or rock with their polyps, or from the mat? And my could you guys help me identify what this is? The weird stringy stuff around my spiorbid worms. Thanks.