sea urchin lost spines, not doing well

[sabazerehi]

my pink decorated sea urchin (i think that's what it's called) has lost like 50% of it's spines for some reason and is not doing well. it keeps trying to climb up on rocks and i find it later on it's back on the sb. since i got it it refuses to eat my hair algae for some reason so i've been feeding it nori algae about every other day. it's still eating, i fed it yesterday and water quality is good i checked that yesterday. anything i can do to help it?

 

[vito is hooked]

I have read they dont tolerate nitrates, how long have you had it?

 

[hmello@bermexin]

It is dying better to get it out now.

 

[rlm2005]

Poor water quality is a killer of urchins. You say your water is fine, what is fine?

 

[sabazerehi]

everything is at zero and ph is at 8.2, i've had it for a couple months and it was doing fine

 

[Skeptic_07]

if you have hair algae, you likely have some excess nutrients

 

[Sk8r]

alkalinity test. S/b 8.3-9.3