Water in all forms is a very meaningful symbol. It may represent emotions, the unconscious, sexuality, and, at times, life itself. Before interpreting this symbol first consider the other details in the dream and the overall quality of the dream experience.
The aquarium could represent a portion of your life or a “slice of life.” Aquariums are generally balanced and fully contained ecosystems. People enjoy aquariums because they find them soothing and relaxing. Thus, this dream’s message may be a call for contemplation and relaxation. It may represent life in a small setting as a compensation to the stress and, at times, overwhelming complexity of daily experiences. See also: Water, Ocean, and River... The Bedside Dream Dictionary
The clear glass of the aquarium allows you to see through into your subconscious or matters of spirit. So, what’s going on in the fish tank, and what creatures live there? A healthy carp, for example, symbolizes an optimistic outlook, whereas dark, murky waters indicate a soul in need of a good housecleaning.... The Language of Dreams
Gazing into an aquarium in a dream may represent contained emotions. It may represent the microcosm, as it contains an entire ecosystem of life, and may invoke contemplation and relaxation.... Ariadne's Book of Dream
The sign of the humanitarian, the appearance of Aquarius may signal that it is time to become concerned with your community and to offer serious solutions to global and social problems.... Ariadne's Book of Dream
To dream of the Aquarian astrological sign symbolizes that you are connecting with your spiritual, mysterious and imaginative nature. Your dream may be giving you the message to find a healthy and productive outlet for your creativity.... Strangest Dream Explanations