Need some opinions please

[Madreefer]

My tank is well established and running great. But I am upgrading to a much bigger sump. I'll be adding about 50lbs of new rock from a freind who is having a HUGE problem with hair algae. I plan on boiling the crap out of his rock before it is added. I was thinking of adding each peice about 4-5 days apart. The rock is obviously gonna be dead so the question is if I will have my nitrates go sky high or any liitle cycles?