Base rock wouldn't be a problem to add, it'll just take time to become live. Be prepared for it to do some funky things for the first couple of months. I added some and it turned flourescent green for a while. I added additional live rock to my 55 last year. We had started with 20lbs, added 10 lbs live and 20 lbs base around the 5 month mark. All was fine.
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