I don't believe that you are supposed to fishless cycle a tank with live plants. Most people that are going to use plants will plant heavily and add a small bioload of fish. The plants use the ammonia produced by the fish and there is no characteristic spike like in normal cycling. We call this "silent cycling." Also I think that plants can get ammonia burns from the pure ammonia.
hmmm i've never heard of that, have you any more details on this method?
in think you'd have to have an established planting of about 75% of the tank for them to use up enough ammonia to prevent a spike and therefore prevent any damage to the fish.
not disputing the method as the theory holds, I'd just like to see a bit more detailed information on it.
you can fishless cycle with anything that adds ammonia to the tank, the problem with prawns and fish food is it takes time to break down into the water therefore you can't be certain you've added the right amount. With pure ammonia it's in the water straight away and you can almost instantly get a correct ammonia reading.