Water in a dream often represents the emotions, so an aquarium in a dream can symbolize emotions thatotions, except in a very limited way.
Dreaming that you are feeding fish in an aquarium can mean that you are seeking emotional nourishment.
Water can be a symbol of the unconscious. If you dream that you are visiting a large aquarium like Sea World, have been restrained. A dream that you are watching fish in an aquarium can mean that you feel unable to express your emwhere visitors come to see water creatures in large exhibits, it can be a sign that you are exploring aspects of your unconscious that you have not examined previously.
Watching trained animals perform a show at an aquarium can mean that you are learning to control your emotions and use them to your advantage.