Urchin losing spines, water param seem fine

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Goodair

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I got a lonhspine urchin who has lost some spines. I know this happens when water quality is poor or when they starve but what else can be a cause?

Sal is 35 s.g.
Ammonia/Nitrite is 0
Nitrate is ~ 5
Temp is 83°, It's been some very hot weeks here, it usually hovers around 78°.
He has loads of algae to eat on the rocks and wall, he is doing a good job of it. I am starting to have a cyano outbreak, I sucked most of it out and ridirected the powerhead to blow on that area.

I don't have kits for other parameters as its currently a FOWRL.
The rock was from old tanks so its possibly leaching something, not sure what to look for in this case.
 

HOW MUCH DOES A FISH’S FEEDING REQUIREMENTS AFFECT YOUR STOCKING DECISIONS?

  • A lot! - I avoid fish that require frequent or specialized feeding

    Votes: 6 33.3%
  • Quite a bit, but an automatic feeder can change my answer

    Votes: 3 16.7%
  • It depends on whether my nutrient export can handle it

    Votes: 3 16.7%
  • It depends on how badly I want the fish

    Votes: 5 27.8%
  • Not much. I’m willing to adjust my routine

    Votes: 4 22.2%
  • Not at all. Feeding demands don’t limit my stocking choices

    Votes: 4 22.2%
  • I usually learn about the demanding feeding schedule after buying the fish!

    Votes: 1 5.6%
  • I haven’t really considered this before

    Votes: 0 0.0%
  • Something else (see my comments in the thread)

    Votes: 0 0.0%
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