Some of those sands buffer you pH so you might want to put some in a bucket with water first and then test it to see if it does or not as you definitely would not want to be having you tank running around a pH of 8.
More than likely you are talking about a substrate made up of calcium carbonate. If so, that will buffer your ph up to the 8.0 range. Thus, not a good substrate for piranhas. It would be better to go with either a gravel.
that sand may contain co2.....that sand maybe limestone....If I where you I would take a sample and see if it fizzes......If it does that mean the the rock is indeed limestone and have calsite.....calsite(calcium carbonate) is a mineral that is created by co2 from fish and rain/water.....that can bring your PH high BTW
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