Do you happen to know what the salinity of the bag water was? What did you do before putting it into the tank? Any drip or %added acclimation?I clipped a sheet of nori to the glass and two of my astreas went to town on it lol. For my other astreas and the urchin, I rubber banded a sheet to some pvc pipe and wedged it in between the rocks; hopefully they get to it soon.
For my urchin, is it normal for them to be sluggish the first few days? They’re responsive to my shrimp cleaning it but not much in terms of looking for food (maybe they were full from living in the frag tank at my lfs). It did drop a small spine overnight as it moved to the other side of the right rock but I figured it was accidental or just stressed a bit.
Dripping spines is no bueno, just keep an eye on it if it drops more. My pencil was quite lethargic compared to my tux. Was happy just grinding away at purple paint.