深海里的忘鱼

This online name 'Deep Sea Forgetful Fish' conveys a poetic and somewhat sad meaning, suggesting that in the depth of sea (can also be metaphor for complex situations like relationships), memories are prone to being forgotten. There's a well-known phrase in Chinese saying 'In deep water fish wouldn't remember anyone it met last lifetime'. So, this name implies that one tends to forget easily when deeply involved in something or just indicates a carefree personality who does not dwell on the past.