Not true at all. Acrually it's a good thing to keep the right fish with corals. This partially insures the corals get nutrients they need from fish food and fis waste and many fish eat things that can harm corals or clams. There are many fish, however that will eat coral,anemones ,shrimps crabs mollusk etc. Some "reef safe" fish will still nip certain corals. Study of individual compatability issues and putting the puzzle pieces together in an aesthetically pleasing way is the art of the hobby.
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Tom
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