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I have thrown a few shells in from time to time with no ill effect. They will dissolve calcium into your water slowly and that’s not a bad thing in saltwater. If you feel they are dirty you could boil and scrub them first. If you buy them make sure they aren’t coated with any kind of preservative finish. Welcome to R2R!I have a few shells lying around, and I also see them in thrift shops and markets occasionally. Is it safe to put these into the tank, maybe with some prior treatment?