It's also a possibility I got phosphate free rock lol

It's crazy what comes off these rocks.

First off, after 3 days the water smelled like a tank of urine and was foaming at the top.

Then I found a small dead crab floating on the top of the water.

I wonder what else is in there.

Yah agreed. I cured 250lbs and it smelled like death for at least a week or two. I actually sealed the tub it was in with poly and cut a hole I ran to a carbon filter. Its been in my tank since november now and looks beautiful now. Starting to colour up well. I found a dead urchin in mine lol.