<a href=showthread.php?s=&postid=10340132#post10340132 target=_blank>Originally posted</a> by juaninsac
I've always waited 6 months before adding any stony coral. A year for SPS.
The "cycle" of brand new freshly imported live rock lasts much longer than a few weeks. You have to consider that all sorts of things that you can't test for are in your water--the toxic compounds released by dying sponges, algae, tubeworms, etc. These animals release more than just ammonia when they die, and they don't all conveniently die in the first couple weeks of being added to a new tank. The point at which the denitrifying bacteria are matching the ammonia and nitrite production of the tank (when NH3/NO2 are "zero") is just the beginning of the story. It takes the rock a good long time to re-establish itself to the new current and light regime it's been placed in.
Just my 2 cents...