I heard a weird noise from my tank last night and wasn’t sure what it was. This morning when I checked there was a couple of my urchins spines on the sand bed which I thought was weird. Today I heard the same noise and went to check and the urchin had his spines inside the wet side. I’m guess last time he dropped the spine or it was cut off? Not sure what he’s finding in this specific corner that he keeps going there… Would an anemone guard help in this case? I’ve never used one but would that mess with my flow? Or should I look into rehoming him?