The fish
The fish are literally bringing
life to your aquarium. They don't just look pretty.
Their waste feeds your plants,
the same way manure fertilizers the fields.
You can choose any kind of
fish, but make sure they are compatible with each other.
Apart from that don't forget to
add Amano shrimps, also called Ghost Shrimps ,Cardina Japonica etc.
These are transparent body
shrimps that eat all algae and ''dirt'' literally cleaning your aquarium.
If you are lucky after many
years, snails might appear. These will come in with your plants and they are
two types. Round shell and Corn shape shell. The first will clean your
aquarium glass, the second will dig into the substrate much like earth worms giving
it air and live from dirt.