Adding more dry rock?

If you are talking about reef saver rock (never seen an aquarium ) then No. Dry rock that used to be live, you need to cure it first.
 
Dry Rock, will not do anything to the tank.
 
I didn't think so. Just so we are clear, I an referring to the dry rock, BRS sells as an example.
Yup, not to worry. I threw in 50lbs without issue. It doesn't have anything on it to create ammonia, thus no cycle.
 
It really depends on how much rock you plan on adding if it will affect your system or not. If you add say a couple prices nothing will happen as far as a mini cycle. If you where to add say double the rock you have it may cause a mini cycle depending on the type of rock you use
 
Yeah adding that rock will definitely leach phosphates into your water !!!!
I added 100 lbs of that same dry never used before still shrink wrapped rock and my phosphates jumped sky high.
At that, rinsed the rock, and soaked it in boiling water and left it in a tub with a running power head for 3 days before rinsing again and putting in tank.
Nothing bad happened, but I had to do a water change the next day and another a few days later.

I have a 150 Gal tank established for over a year
 
if the rock that is dry was dirty at one point then what Z06 said can happen.

You are best to try and make sure the rock is clear of anything. If it is the BRS rock I would still do a vinegar bath over night. I wouldn't add it right to the tank but try to curse it for a month before adding.
 

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