There are basically two methods of cycling:
a) fish / invertebrates, which is the most recommended for fish that contribute to complete the process.
b) without fish, a method I say incomplete because it is formed and those bacteria that break down nitrogen resulting from physiological processes of fish. The method by which this is done is by adding cycling daily food without fish in the tank for 3 weeks after that will put the fish that we want to have in your aquarium. This means there is a risk that the fish will suffer, as they are basically put in a system that can not be cleaned.
The exchanges have helped with weekly water 20% of the aquarium and fish fecal suction on the bottom.
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