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I have a cupel limpets in my main tank and refugeum they mostly stay in the sand. The other snail I think I have one to. Never had a problem with ether.
I have the dome snail in my tank. It just sticks on the glass. I think I'm just going to throw it back as it doesn't do anything. I honestly wouldnt put urchins that you are unsure of if your tank has coral.