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putting in uncurred rock causes die off to happen in your tank, which in turn starts the cycle procees, cured rock has minimal dye off but when put in a new tank will kill off stuff anyways, which will again start the proceess
from what i understand if you used cured rock cycling will take less time (less ammonia to convert) but uncured will eventually supply a greater number of beneficial bacteria. I'm just learning too...i might be wrong