Keeping the levels of ammonia low via water changes will also help the tank cycle faster as it will mean less bacteria is needed to handle the ammonia and subsequent nitrite. When ammonia is broken down by the bacteria, 1 ppm of ammonia becomes 2.7 ppm of nitrite so the lower you keep the ammonia, the faster the tank will eventually cycle. Really, all you are looking for is enough bacteria to handle the ammonia on a minute to minute basis so to speak. Fish don't just suddenly put 1 ppm of ammonia in the water as we do during a fishless cycle. The ammonia is added gradually as waste breaks down and as ammonia leaves the fish's body through it's gills so much less bacteria is needed at anyone time than what would be needed to quickly break down a high level of ammonia.