Help with Id of rock

droopy395

New member
This past weekend I bought a salt set up at a garage sale for super cheap. It had about 50# of this rock. I've never seen it before and need help if I should/could use it in a tank and if so do I cure it the same way? It's fairly light weight and seems to be very porous. Having a lot of holes. Most have flat bottoms as if it was sawed or harvested.

saltwater noob
 
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