Dont mean to contradict you mebbid, not my intention, BUT I have used so much dry rock over the years and never ever had a spike. I of course rinse it off but thats it. I also have tested after adding it, just to be sure I;m good and never saw any spikes in anything.
Perhaps it matters where you get your base rock?
180g Reef - 60g Rimless Reef -90G FOWLR- 125g Malawi Cichlids- 40b REEF- 34g Fresh Planted-working on- 20L FOWLR- working on
I have a mix of many different saltwater fish amongst my tanks, but I love my Tangs most of all.