Unsure (never kept urchins), though it would definitely destroy that branching Coralline I mentioned earlier, as well as any other potential macroalgae additions. Maybe it's spines could also injure the ray.do you guys think tuxedo urchin safe in this setup? I'm having gha issues despite all my tests showing low NO3/PO4 and any other CUC i can think of is going to get eaten by my ray
@Jay Hemdal what do you think?
Edit: Heterocentrotus mamillatus might be a better choice with its blunt spines, but it seems very hard to source.