The position of the mouth in the fish, tells us where it eats and lives.
Fish like guppies have the mouth aiming up, so they will eat from the surface. Platies have the mouth aiming forward, so we can tell they will live in the middle of the aquarium. And other fish like otocinclus and corydoras eats from the bottom, as their mouth are aiming down.
It is important to feed this last ones with algae wafers so they have the chance to eat well also.
This video explains this very well.
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