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I use the vinegar test on the rocks I put into my tanks. This one may not be safe to use. Let the piece dry. Then, put a few drops of vinegar on it. If there's a reaction of any kind, then don't use it. If there's no change, then rinse it well and if you want, put it back into the tank.
Ok, will do. I'm assuming some rocks have higher metallic properties ? I'm really loving pulling from nature , I know it's risky , but there's something about using natural decor you've found.. Anyway.. Thanks for your help