YOu might have a mini cycle, not sure. If you have to add more liverock make sure it's cured. As for the sand, there is a lot of good bacterias in it but depending on the age of your current tank and the dept of the sand bed, it may also have anaerobic pocket that could release deadly gas and kill everything in your tank so go very slowly and be sure to remove everything alive before preceding. In case there is some gas released at least your fish and coral won't be there to die from this poison.
I would keep part of the sand if it is not black or too dirthy because there is probably a lot of living creature in there that take a long time to establish. I read that one of the reason sps grow much better in older tank is because of the presence of living plankton.
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