PenMan said:
Take a look at this article. It explains a lot of the problems with "cured live rock".
http://www.themarinecenter.com/rockbs.htm
I wouldn't trust that article much... it comes from someone who's trying to sell uncured rock
There is a huge difference between "pre-cured" (which means nothing IMHO), which is what a lot of online places sell, and "fully cured", which is what PA sells (and others, I'm sure, but I can only speak with regards to PA).
"Pre-cured" is supposed to have been cured at the origin, but you'll obviously have to cure it again as it's been dry ever since it was packed in the tropics; "fully cured" has been cured in the seller's tanks, and the only dry time is the shipping from them to you, which ideally will be overnight. So there shouldn't be any more curing needed, it's been done by the seller and that's why you pay a premium for it.
Anyway, don't get me wrong, I'm not pushing for PA here, just relating the experience I had with their rock. And, as I said, if I could get the same thing locally, I would (partly to save on shipping, partly to support a local store).
Nuno