May I suggest using water from the main tank instead of brand new, sterile SW
. It would be somewhat better than using new SW
. (maybe pulled from your last water change).
Also, if you have any existing biological filtration that you could borrow from the main tank get it in there with some water movement. It would at least give life on the rock a chance to survive.
Think of the LR
as living...treat it like a fish. Your curing tank is essentially a brand new aquarium, and we all know that brand new aquariums can't support life until they cycle.
If you haven't received the rock yet, there may still be time to cycle your curing tank before it arrives.