You aren’t answering the question. Was it dry (and stored dry at the lfs), or did come out of one of their tanks and you transported it wet? If it was dry, it’s not technically live rock, it’s man-made aragonite rocks that have been painted purple (it is not real or live coralline algae) and seeded with bacteria spores they call ‘life rock’, in terms of aiding in nitrification and denitrification, it is not nearly as good as real, wet live rock. That’s not to say it is bad, it doesn’t have all of the pests associated with live rock, and it will eventually have all the bacteria that real live rock has (at least in terms of the bacteria we want in our tanks), but it is not instantly aiding in the cycle the way real live rock would. If that is the kind of rock you got, if you can get a small piece of real live rock to seed the rest, it would be beneficial and speed things along (though you do run the risk of introducing pests (there are many), but to me it is well worth the risk, IMO a reef tank isn’t a reef tank without all of the microfauna that only comes with real live rock, ie copepods, amphipods, feather duster worms, bristle worms, and all of the other little creatures that come in on live rock). If you can’t get any real live rock, you’ll end up getting some of these things from coral frags (especially if they are on live rock rubble instead of frag plugs). I will say, I recently set up a tank using mostly the rock you most likely purchased and seeded it with real live rock, and used liquid bacteria (seed by aquavitro), and the tank wasn’t completely cycled in two weeks, let alone two days. I wouldn’t add fish until you’ve observed zero ammonia and zero nitrites for several days (or a week) while still ghost feeding. There’s just no way you have a stable bacterial population in two days.