I'd say that's a judgement call you'll have to make. The fun part about live rock is seeing things grow that you're not expecting, or haven't seen before. The not fun part is finding out that that cool little creature you were so excited about was in fact a baby aiptasia.
Live rock can only introduce what happens to be on that live rock, so if you're looking for cool reef life that you can't buy separately, so to speak, getting the highest quality live rock is key. The pretty, uncommon, delicate things have a hard time surviving shipping (else wise they wouldn't be uncommon), and they certainly seem to not like the conditions present in live rock holding tanks. The organisms that have no problem with shipping and holding tanks are the ones that are in every body's tanks - bristle worms, aiptasia, 3 or 4 major genus of pods, and a couple kinds of tunicates and sponges. While the live rock may have originated in Fiji, by the time you buy it it's possible for there to be very little actual Fijian sea life left on it, having been replaced by whatever organisms were in the tanks along it's chain of custody, and the longer it's been in said tanks, the less of the cool stuff I think there will be. The more live rock you start with, the more chance you have of cool things being on it (as does the chance you'll get a pest), so if I was only going to add one or two pieces, I'd want to be very picky about selecting those pieces. They'd need to relatively fresh and have tons of obviously identifiable diversity on them. If you're looking to seed a diversity of life, you'll want the rock to have been treated as much like a prized coral along it's chain of custody as possible. Otherwise all you'll really get from it are things you'd probably acquire without even trying to anyway. It's a shame no one ships rock in water any more.
FWIW, I added live rock to my display after cycling a couple of hundred pounds of marco rock. The way I tried to avoid getting the nasties was by striking a deal with the now closed Red Coral Calgary where-in I bought an entire box of the stuff off one of their orders (it was about 66 pounds total weight). I stayed in pretty regular contact with Kevin nearing the ship date, and the night it arrived I picked the unopened box up from him as he got the order back to the store. That order came directly from Walt Smith, so it hit no holding tanks between leaving the ocean in Fiji and getting to my house. None of the really big things survived (there was two dead dinner plate sized brittle stars and a few dead largish crabs, sad), but there was tons of macro algae, lots of different coralline species, several kinds of snail, and three different species of encrusting SPS that survived the trip that are now actually some of my largest corals.
I still got bubble algae and aiptasia, but that was my own stupidity. I introduced them later, they weren't on the rock.
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