Personally, I don't think the removal of 20 lbs of rock would ever cause your levels to rise that much or that quickly. I think that your addition of light has caused all of these "problems". I say problems in quotations because I believe that time, water changes, and keeping your ER rocking out the skimmate will quickly balance your tank.

The thing we DO need to worry about is your calcium and alk levels. I'd cut all supplements and keep up with frequent water changes until they come down to a normal level (speaking about calcium).