If you are into gaming, or have friends or family who game, you will want the Xbox game Grounded.  It has a koi pond of which ant sized players need to explore and defend!
 
Grounded is a first and third-person cooperative survival game by Obsidian Entertainment and Xbox Game Studios. It was first revealed at X019 in London and entered early access on July 28th, 2020.
 
In Grounded, the player character (Max, Willow, Pete, or Hoops) is shrunk by Ominent's shrink ray to the size of an ant.  The player must survive in the micro-world of a suburban backyard alone or with up to 3 additional players.  In the dangerous landscape, players work to progress through story-based quests or explore the farthest reaches of the backyard and its unique biomes.  Players must gather resources, craft, and build bases with everyday objects while searching for life-saving resources such as dew off grass.  Players also craft armor to defend against a host of creatures, which includes diverse insects, arachnids, and others, both hostile and friendly.
For more information check out these web sites:
Grounded (video game) - Wikipedia
Grounded Guide: How to find and access the Koi Pond secret lab | Windows Central
Grounded Guide: How to craft Koi Fish Scale Armor and Bone Trident | Windows Central