The Curing Live Rock?
article covers how to cure if buying uncured lr
. The risk of adding uncured lr
to an existing tank is that it would drive your nh3
higher (from the die-off) then the bacteria can process it and kill your livestock.
If buying lr
from your lfs
that is already cured and in a holding tank usually there isn't any risk to adding directly to your tank because any die-off would have already happened. The only exception is if they just got the rock in at the lfs
Personally I wouldn't risk adding any lr
directly to a tank that has fish/inverts in it already. It's much safer to follow the procedures in the article until your nh3