Fish tank cycling is a long process that ensures the water quality in your fish tank is ideal for the fishes to thrive. The cycling process allows us to establish an excellent bacterial colony as well as normalize the nitrogen cycle. Here the nitrogen to nitrate helps stabilize the water chemistry. The most important thing to note is that this is not an instant process and takes considerable time to establish the ideal water conditions.  You can add around ten to twenty percent of the total fish load initially to test the water. This will cause a spike in nitrogen and ammonia levels, which may not be deadly to the fish. Once your filters are working well, and the water has considerably stabilized, you can add more fish. You will also have to regularly test the water to help you achieve the optimum conditions in water through cycling.