black spiny urchin problem

i got this urchin from the pet store a while back . he was doing fine . now all of a sudden his spines are getting white horizontall lines. now they look like a candy cane but with black and white? whats going wrong here?
 
Its not uncommon for the juveniles of this species to have whtie stripes on the spines.

Normally, when an urchin is sick or dying it will loose its spines.
 
oh good i was worried all the ones ive seen are bitch black. this one looses a few spines but not a lot. thanks for tha info apreaciate it
 
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