So I know that some things that we use in freshwater cannot be used in salt- like many plastics or wood. I have some gemstones (the kind you tumble- mixed like quartz, flourite, amethyst, etc.) as well as a few small geode pieces that I use in freshwater. Can those be used in saltwater? I keep getting Google results talking about cleaning or cleansing stones in saltwater. I'm not worried about dirt or casting spells here (for this anyway, lol), I just want to decorate my tanks without endangering my critters.