Can tuxedo urchin regrow these?

[kjkszpj9]

Is my tuxedo urchin dying or why is it getting these patches on the blue parts? Can it regrow them or is he cooked?

 

[Tahoe61]

Is the Urchin actually losing spines?
Are you supplementing the diet, and does it have enough algae to graze on?

 

[kjkszpj9]

Is the Urchin actually losing spines?
Are you supplementing the diet, and does it have enough algae to graze on?

I cant really tell if its losing spines cause its harder to see it losing the spines compared to a collector urchin. But the blue parts it has a few bald spots but idk if the spots are getting bigger or not. And yes it has algae to graze cause i let my glass get a decent amount of algae on it.