An aquarium is the sea in a glass box, read as feelings kept on display but contained. It may also point to feeling watched, or to a life that seems too small.
Where in your waking life have you met something like this lately?
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.