I was able to get an old carbon filter from a friend who has an established tank to help jump start my tank. Her filter media is in front of the carbon, but I'm assuming that there is plenty of bactria growing on that to help get my tank cycled. It really doesn't fit in my filter, but I have managed to wedge it in. How long should it take until the bacteria begin to grow on my filter media and I can safely remove the donated media (without causing an ammonia spike)?