At some point you need to remove the zeolite. Its actively working against what you are trying to do. Once its absorbed all the ammonia there will be nothing to cycle the tank. Once its used up, all that ammonia will start to build up again.
You might think reducing the ammonia is helping, but nothing is dying and controlling ammonia with frequent water changes would be the way to go until either the ammonia stops leaching, or you identify whats causing it and remove it.
You might think reducing the ammonia is helping, but nothing is dying and controlling ammonia with frequent water changes would be the way to go until either the ammonia stops leaching, or you identify whats causing it and remove it.