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Depending on what kind of rock it is (as mentioned above) it should work fine.

I do something similar, The company I work for has a pit we mine fill sand for construction, it ranges from fine sand up to about 3/8" rock. I screen this out to make the rock for my tanks. I don't boil it I just rinse it.

As for the sand having nutrients, it depends on the silt content of the sand, if you rinse it, and nutrient will probably be gone.
 
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