Yes, the API Freshwater (there is a different marine one) Master Test Kit is the one most of us like and use over here in the beginners section as a great learning tool for understanding mature media and biofiltration.
I disagree slightly that the tank water will contain no ammonia (although it's mostly a matter of semantics!) A properly running freshwater tank (with fish) will always have a low level of ammonia that is in the process of moving from the fish (and debris) -to- the bacteria in the filter. Our liquid-reagent kits will not detect this level as it is below a part per million and they are simply not that sensitive.
As I say, however, that's all splitting hairs and in the practical context in which the question was asked, james_fish's answer is correct, tank water does not contain the amount of ammonia we'd use to encourage new bacteria, and yes, mature media is the way we move from tank to tank without ever again having to do a "from scratch" cycle like a brand new beginner might have to do.
The ideal way to "clone" your biofiltration from an established tank to a new filter on a new tank is as follows: First, never use more than 1/3 of your established biomedia (your main sponge or ceramic gravel or whatever) or else your existing tank might suffer a mini-spike of poisonous ammonia or nitrite. Take that 1/3 of "stuff" and work it into multiple places within the new biomedia or at least make sure it's stuffed in just prior to the new biomedia in the flow direction.
It's ideal before you even do this mature media transfer to already have obtained the correct type of simple household ammonia (yes, Boots, either in their larger stores or from their online site, is apparently the easiest in the UK) and to have dosed the tank such that it's at about a 4ppm concentration (our web calculator helps with this, as well as your API kit.) You then perform the media transfer and begin logging daily 24hour results for ammonia, nitrite(NO2), pH and nitrate(NO3) as per Fishless Cycling instructions here in our BRC. After the media transfer you should also "clean" the existing mature filter in the new tank as if it were a cleaning bucket. This will add still more bacteria from the mature filter to the new tank, as it will be pulled into the operating new filter.
If the clone operation "takes" successfully, it should only take 5 to 10 days of fishless cycling to "qualify" the filter (you qualify it by proving that 4-5ppm of ammonia dosing can be dropped to zero ppm ammonia and zero ppm nitrite(NO2) within 12 hours from when dosed each day for 5 to 7 days in a row.) If your newly cloned filter can do this then the fish can be introduced to pristine healthy water.
~~waterdrop~~
