Early on in the episode, Steven goes to sleep in his London apartment only to wake up and mysteriously find himself in a small European town. He convinces himself he’s in a nightmare but upon his return to London, Steven realizes that he’s lost three days of time and even more mysteriously, Gus has grown a second fin.
With the episode titled “The Goldfish Problem,” we can’t help but wonder what the meaning of the goldfish is.
Source: https://www.distractify.com/p/moon-knight-goldfish-meaning