What does it mean to dream about aquarium?
An aquarium often points to feelings viewed at a safe distance, the depths of emotion held behind glass where you can watch but not be swept away.
Four ways to read it
Each reading below comes from a named tradition and a cited source, so you can see where it came from and decide what fits your dream.
Freud
Freud would read the aquarium as the deeper, watery part of the mind made visible and contained, urges and feelings held behind glass. You may look at what usually stays below the surface. Note whether the water is clear or murky.
After Freud, The Interpretation of Dreams (Brill trans., 1913), public domain.Jung
Jung often linked water with the unconscious, and an aquarium frames that depth in a way you can study calmly. The creatures within can stand for contents of the inner life observed from outside. Ask what you are watching but holding apart from yourself.
Jungian concept (our summary).Modern
Under the continuity view, an aquarium may reflect waking thoughts about emotions you are examining rather than feeling fully, kept at a manageable remove. Calm water can echo composure, troubled water unease. Consider what feelings you observe from behind glass.
Continuity hypothesis (our summary).Mythological
The deep waters teem with hidden life in many traditions, home to creatures of mystery beyond the surface world. To gaze into the depths was to glimpse another realm. The aquarium brings a small window onto that old wonder.
Rosmerta Publishing editorial synthesis (after Bulfinch; Frazer).