Ammonia isn't an issue. The bacteria live off ammonia and levels even as high as 8ppm won't cause them any harm. But the target ammonia level is at least 4 ppm
. Well above the lethal level for any fish or most cuc. The issue, and again, it's not terribly critical is the nitrate waste that may exceed 100 ppm
So normally no water changes during the cycle as it just dilutes the ammonia your trying to elevate. BIG water change after the cycle is done. Keep your lights off during the cycle as well to keep algae from growing.