generally if the rock is well cured there should be no cycle... I have heard that you should only add ~ 10 % of the current amount of rock in your tank eg. you could only add 1lb if you had 10lbs in there.
That being said I have added ~ 70 lbs of cured rock to a 180gal that had about 100lbs in it with no ill effects.
I think most people will have an opinion on this one... Like everything else in this hobby if you can stand going slow it is always better in the long run
just my .02
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