165-gallon In-ground Prefab Pond

Had no idea what I was doing in regard to keeping fish, especially Koi.  So when I moved into my house, I got this 165-gallon pond to keep Koi and Goldfish.

There was a major flood in 2020 and the hydrostatic pressure of the water under the ground pushed the entire pond out of the ground.  So, we built a larger pond on the patio (see 350-galllon pond)