Otherwise there would not be enough Ammonia to properly jumpstart the cycle. Some people even leave their rotting shrimp inside the tank until it's completely dissolved.Why?
I agree, John's method also works. I just like the science and level of control of knowing precisely how much ammonia is being introduced. Instead of a decent ammonia spike then a rush of bacteria to clean it up, using the pure ammonia/testkit/bacteria method allows one to draw the cycling out longer. Remember, especially if starting out with dry base rock, bacteria takes allot of time to colonize deep into the rock's porous structure. The longer you can wait before adding bioload, and introducing undesirable algae, the more time the bacteria and corraline algae can gain the upper hand. If you start with a decent canvas, the system gets very stable and corals/fish/inverts will thrive.Otherwise there would not be enough Ammonia to properly jumpstart the cycle. Some people even leave their rotting shrimp inside the tank until it's completely dissolved.
In my 12 years experience, I always wait until the piece of shrimp dissolved to have a proper cycle. Otherwise, my tank keeps undergoing a mini-cycle everytime I overfeed or add any additives or supplements.
But others have different approach.
If you get pure ammonia make sure to shake the bottle first. If it foams up at the top it has an additive in it that's bad for the tank. I saw that on a YouTube video and it's a good thing I did. I would have had no idea to look for that.All my rock is dry... I need an ammonia source. Checking my local hardware store shortly to see if they carry pure ammonia.