A small fish pond built in the courtyard, and netizens want to dig one after seeing it

Actually, building the garden wasn't much of a big undertaking. I recently built a fish pond, and all told it was just about ten days' work. I'm just recording it because it's quite interesting. Now when I look back through it, going from a barren garden to a garden full of greenery, I'm really happy
The pond as a whole looks like this
The pond is 50 cm deep. I asked many experienced flower growers, and they said this depth is enough for keeping fish. Also, I'm in Guangxi, and it seems water depth is related to the local climate, though I'm not too sure about that either. When the craftsman building the pond told me 50 cm deep, I also doubted whether it would be too shallow. Now facts have proven the water depth is very suitable. There's also a safety consideration: I'm on the ground floor, so I also have to consider the fear of a child coming to play and falling in. That's no joke.
I don't understand the filtration principle either, so I also called in professionals to help set it up.
I fiddle around there for one or two hours every day, for a full three months. My friends ask me just how many mu of flowers I've planted
The yard is very small, and many of my original ideas can only become the next dream. I hope your small yard gets more and more beautiful, and come have tea then. Thanks for coming to see the flowers, and thank you for liking them!