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What happens with dry rock is that the stuff that was once alive within the rock is now dead and just hanging out. Once it is put into your tank this dead stuff continues to decay releasing, among other things, nitrates and phosphates. This "release" is typically done during the curing process. You will now be curing this dry rock in you tank, so expect an increase in nitrates and phosphates.
Not true of all dry rock. Reef saver for example is mined, there is absolutely nothing organic left in it. Where as dried Pukani for example is just dried live rock. And that one is especially troublesome because stuff gets very deep within it and can't be reached, so it decays. But reef saver, Marco rock, and the like which are land based quarries are totally fine.Dry rock is dead rock. Even if it looks white and pretty, death lurks within. All dry rock needs to first be cured. You can get away with adding a relatively small amount of rock with minimal impact, but the more you add, the more nitrates and phosphates will leach out. If you have the means to handle this extra N and P, go for it.
I made that mistake about dry base rock I was at my lfs and in their dry base rock bin was a couple rocks that had the very unique shape I was looking for well long story short I didn't think those two rocks would be a big deal till two days later woke to tank full of brown diatoms everywhere. This tank has been set up for about seven years now. And now I'm fighting diatoms again I'll never buy dry rock again only live from local store

