Has anyone ever heard of or seen a pincushion urchin where it's spines get stringy? I have 2 of them in my tanks and their spines have always been stiff, but I was over at a friends house and saw that his pincushion still seemed to have all of his spines, but many of them looked almost like hair algae flowing back and forth with the current. But it wasn't green and it wasn't algae, it just flowed like hair algae would. I didn't get to take a picture because we were in a hurry to leave, but has anyone ever heard of that? I can't seem to find anything about "stringy" spines, only losing spines, which this one doesn't appear to have a problem with. He was up on the glass just doing his thing when I noticed it.