Hello all, I got a tuxedo urchin a week or two ago and just a few days ago I noticed it was upside down on the sand, thinking none of it I left him but when I looked later he was still there. When I tried to pick him up it’s spines were falling off and it had no feelers. Current parameters are 0 nitrate and phosphates (I have some algae that is using it up before it can be tested. This was the reason for the urchin) and salinity is around 1.025 or so. Any info helps, thanks.