As far as that treasure chest and sunken ships and such, they won't work in a salt tank, at least not for long. There are several reasons why you shouldn't put them in there. In the first place, if they have any metal parts, the salt will eat them up, not to mention that they will contaiminate your tank. Also, even if they don't, eventually the salt would gum up the works and they would just stop working anyway.
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