A goldfish is read as small joys, contentment and life within limits. Tradition connects it to simple pleasures and to the feeling of a small but safe world.
When this appeared in your dream, what were you feeling?
My Cosmic Code has a private dream journal. Write a dream down and the app picks out the symbols in it, shows what dream books say about them and, over time, which words recur across your entries. The journal is stored on your device only.