My buddy whos a noob started a saltwater tank about a month ago,he tried to to bleach the coral skelletons and the live rock whichs is dead now and killed all the damsels. I told him to trash everything but can he reuse the sand or trash it to?
Let it soak in fresh water and add dechlorinator to it. You can also test the water for chlorine after it has been sitting in fresh water using a kit like this:
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