It is not recommended to introduce animals to your pond, particularly fish. Fish produce a lot of waste and do not thrive in such a small space.
The presence of fish may cause excessive algae to grow, using up essential nutrients and leading to plant death. So instead, let the creatures come to you and keep fish in a regular goldfish bowl or tank.
If true crime defines your free time, this is for you: join Chip Chick’s True Crime Tribe
She’s Showing You How To Grow Dragon Fruit From The Seeds