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How would you treat salt water shell before putting them in a fresh water tank?

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I often collect shells (abalone, sand dollars, and large clam) and rocks from the beach near my house and use them in my freshwater aquariums. I rinse them well, give them a good scrub and then dip them in boiling water for a few minutes, allowing them to air dry thoroughly in the sun.

You purchased shells from a retailer, making them even less likely to carry some pathogen as they've been out of the water for a long time. The little salt they may leach is unlikely enough to bother your fish. I have snails and ADFs along with the fish. I've never noticed ANY change in tank behavior or animal health.

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