I was going to buy 40 lbs. of cured live rock today, but I don't know if I should anymore... The dead rock that is in my tank is obviously curing... My ammonia is at 1.0ppm nitrites 1.0 nitrates 20ppm... If I add the new cured live rock will it kill the growth on it??? I don't know what to do.... Should I go buy the LR or just let the stuff in my tank cure...It came from a tank that had been drained for 6 months