Urchin dying?

If you don't buy an RODI unit, you can always buy RODI water or mixed water from your local fish store.
I would be careful with getting RODI water from your LFS. Make sure you trust the store and maybe test the water because I ended up buying "RODI" water that had a TDS way above 0. It turns out they weren't changing their filters.
 
I have been doing monthly water changes using tap water and haven’t had one issue with invert deaths because of that.
 

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