I'd quarantine it and deal with whatever you don't want in buckets if you're gonna be that worried about "pests". You can get dry rock and add micro fauna in from Indo pacific sea farms , only thing that got in that I didn't put in was bubble algae (never seen more than a few bubbles over the past 4 year. That and being selective with my frags, I've not introduced anything I didn't want and am happy with the results, it does take forever and a year to mature though. If it's one of your first systems, I'd just use the live rock as is, do a high salinity dip to flush out crabs and shrimps and what not and no just put it in.