Quote Originally Posted by bprewit
I set about 30lbs of rock from my tank outside almost a week ago. I want to put it into the new tank and for now have it sitting in a tub of saltwater with a powerhead. There were no corals, sponges, or anything else on this rock that would still be in a state of decay so how long should I let it cure so to speak before I put it in the tank?
Just out of curiosity, why did you do this? You must have known that EVERYTHING on the rock would die, leaving you with dead rock. Is it coated with white (dead) coralline algae? Did it stink for awhile? Does it still? You'll have to cure this again; I would suggest getting some light on your tub and do several water changes on it; Gary's right on the ammonia, except I'd wait until nitrites are gone as well, then change all the water it's in, let it sit a few more days, and see if there are high nitrates. If not, you're good to go. Ths is assuming there's stuff in your tank you don't want to kill with another nitrogen cycle. You'd be amazed at how long dead live rock (how's that for a contradiction) can leach low levels of ammonia into a healthy system.