Sea urchin shrinking???

ok, i have a long spined sea urchin in my tank for about 4 months no. problems with him, has grown alot and eating well. so about 3 days ago i came home and all his spines are like half of long! his body is still just as big, hes still eating and moving around the tank np. but his spines are really short. i dont see any broken off in the tank, and no fish seem to be eating them.

any ideas??

 

anyone??

 

"Losing spines is never a good thing, usually caused by stress or illness. Double check your water parameters, and make sure your pH and SG are stable, small swings in these can negatively effect the urchin greatly. Otherwise take a look at our urchin FAQs and see what applies. UrchinFAQs ."

That ^^ is from wetwebmedia. I didn't go to the link they gave, but I suggest you do so. They usually don't last much longer when they start losing spines.

 

Yup, unfortunately.

 

no!!!!!! well its just like his spines are shorter, not like theres spots missing of them... ill check water specs and go from there