So I have a pincushion urchin who usually is very active. I did a water change a couple days ago and he spawned and now hasn’t moved from his spot for about 2 days. I know he isn’t dead cause his spines are moving and he’s holding onto a shell. He hasn’t dropped any spines either. I just find it weird that he used to be so active but now he doesn’t wanna move. Should I be worried?