Happy Aquarium, is a real-time video game, developed by CrowdStar. The game was available from the social web Facebook. After Adobe Flash Player shut down and stopped producing updates on December 31, 2020, Facebook removed games that had Flash Player available, and Happy Aquarium was one of those games. The game made it possible to acquire, sell, feed, mate or train fish and other marine animals. The app was well known on the social web with millions of active users per month.