For corals and clams you are going to need lighting if you plan to keep them in there for an extended period. The skimmer would probably be a good idea as well, but water changes would work as well. I think quarantining everything that goes in the tank is a good idea, but to be honest I don't do it myself. I tend to use only trusted sources (basically tanks I have seen in person) which works as well IMO, but limits my choices.
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Rich Overton
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