Time for Introducing fish in planted aquarium

In the case where a new aquarium was set up using brand-new filter media, fish should be added after three to four weeks when the environment within the tank is stabilized and aquatic plants grow almost up to the water's surface.
If an existing filter media already colonized with bacteria is used, it is possible to add fish to the aquarium when ammonia is no longer generated, i.e., about one week after the setup, as long as no algae is observed in the tank.

It is advised to add fish in about two phases, since the balanced self-purification process within the tank can be affected by adding a large
number of fish at the same time.  You might want to add fish as soon as possible once the planted aquarium is done, but it is, for the sake of fish,
better for you to wait until the environment is adequately stabilized (i.e., the condition in which water is clear and sparkling, no algal growth is
observed and aquatic plants grow lush and healthy).
Keep in mind that overpopulation of fish must be avoided to prevent growth of algae.  Adding a relatively small number of fish and feeding easily
digestible and absorbable food  are a key to
maintaining a beautiful planted aquarium.