sand

Yes and no lol
That is the vinegar test but some sands that failed have been used with success, what kind of sand is it that your trying?
 
Try HD or walmart and look for kolorscape, its packaged by old castle. Many reefers have used it, Im not sure if Lowes has it or not. Also Durascape has sand in an identical bag that i heard was safe also. Bag is blue.
 
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