On the official PlayStation YouTube channel a trailer has been shared for something called Aqua TV, which looks to be a virtual aquarium. Or an interactive screensaver if you want to get to go for the more obvious comparison. According to the gameplay trailer, where the word gameplay is used loosely, people will able to place different fish and ornaments in the virtual tank as well as other things.
Aqua TV will be available from December 12th/13th but you can already purchase it for £3.29 on PC, and £2.99 on Android devices. Cheaper than a real fish tank set up at least. And to be fair it could be used as learning tool