06-20-2008, 07:56 PM
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Ammonia is converted to nitrites which is converted to nitrates. So everything but the nitrates will drop, and you do water changes to remove nitrates. Doing a water change generally slows down the cycle process and isn't necessary if you don't have fish in the tank. You'll eventually want to do water changes to bring the nitrates down to a safe level, but gradually, not all of a sudden. Also, make sure there's always an ammonia source being added until the fish are put in the tank.