Te rock you recieve will probably need to go through a cycling, the dying stuff needs to die off b4 you start to revitilize the LR
. SMell the rock when u receive it and if it has any non ocean smelling odor, any rotten smell at all, then i would QT
that rock until the smell goes away and the water tests come out with no ammonia and trites or trates.
I moslty guarantee you if you add the rocks directly, it may cause an ammonia spike. Keep in mind the rocks are not shipped in water... so stuff will start to die
If you QT
the rocks and the water tests come out good after a few days, then the rock you got is cycyled and made it thru the shipping process pretty well!
I would not put the LR
into a tank with existing fish before knowing for sure it was cycled properly.
Hope that helps!