We had a long spined urchin in our tank for over a year with no problems.
Like all urchins, they have a tendency to knock things over, but he never hurt any of our corals, and certainly not our fish.
The only reason we got rid of him was that he outgrew our tank big time.
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freshwater 55gallon bowfront
Saltwater 55gallon column seahorse tank
saltwater 65G mixed tank w/ 30G sump
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