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From what I've read, when doing a fishless cycle with ammonia, you are supposed to add ammonia everyday, (but I think in a smaller quanity than what you added). The ammonia then becomes food for the bacteria that turns ammonia into nitrites. So my guess is that you wouldn't need to add additional ammonia, until the ammonia level drops to maybe 2ppm or so.
Once nitrites start to appear, and you ammonia level drop to zero I think you are supposed to keep adding ammonia, but at a lower amount. This way the bateria that turns ammonia into nitites still has food and doesn't die off. Once the nitrites drop to zero and you start seeing Nitrates, you can stop adding ammonia and start adding fish.
Good Luck
John
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