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Discussion Starter · #1 ·
Here is a rock that I would like to use in my tank. It has some metalic sparkle to it so I dont know if I should use it or not. I got it from a friend who had it in a saltwater tank many years ago. It has been on his back porch since then. Any ideas?

 

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Discussion Starter · #3 ·
Yes I have decided that I wont be using it. Its such a cool looking rock, but it scratches with my knife, and has some sort of metal ore in it I reckon. I will try the vinegar test when I get some vinegar just to see, but I bet it fizzes. Thanks!
 
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