The turbo snails are perfectly fine. The reason why they go over them is to eat any algae or left over food that may be on the other side of the corals or at the base of the coral. My turbos do it all the time by crawling over my zoes. What type of urchin do you have? Most urchins like the pencil sea urchin and the long sniped sea urchin are fine but I have heard of some cases were they eat corals when they do not have enough algae. With any urchin it is best to be cautious.
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