[ilamont]

Here's a video I did three years ago showing how the small pond is set up. It's probably about 4 feet long (~130 cm) and with a deep spot of about 2 feet (~60 cm) ... if it's too shallow the fish would die, either from racoons getting them in the summer or deep freeze in the winter stopping the pump and possibly freezing the water all the way through.

https://youtu.be/8ExfrhjpMp4?si=dJ1pOaw-zLA-Rvk2

FWIW we are only using tap water (which comes all the way from the Quabbin reservoir in western mass) and rain water. I think at the beginning we used some sort of algae treatment once or twice during the summer but in the past 5 years it hasn't been necessary as long as the pump is creating a bubbling flow and there aren't too many fish, usually no more than 3 or 4 small to medium goldfish/carp varieties ... koi, shibunkin, and comets.

[Jorslu]

Sincerely, thank you for the explanations and youtube video. They were GREAT!