Adding ammonia instead of fish is much better and faster. Bacteria colonize by feeding on ammonia. Back in the day, people used to cycle their tanks with hardy fish -- idea being that as you feed the fish, the left over food and fish waste will decompose and turn into ammonia, which is food for the bacteria. It works, but it can be slow depending on how much ammonia is in the tank as well as dangerous to fish. Not to mention all the extra phosphates being introduced in the tank.
I have been cycling all my tanks with ammonia and bacteria and it works great. By adding ammonia directly, you can control the ammonia concentration in the water creating the perfect environment for the bacteria to grow rapidly.
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