I guess what has been plaguing me is that my live rock has had a few aiptasia. I worry that in a new setup it could run rampant. I suspect there is always some small hidden spore of a pest just waiting to take hold. that said, I suppose the live rock from TBS could also have the same hidden pests. When I set my first tanks up in the early 90s, I used live rock shipped up from FL via air. And it was awesome. I had a few Mantis (which were a pain to remove) but I loved all the little surprises that showed up over time. D2Mini had me thinking I'd go this route. But then my mood swings back to using the dry rock and being 100% diligent in quarantining everything that goes into the tank - snails, rock, corals, fish. Anyway, I will figure it out this weekend.