I have a fair size pond that came with a house I just bought. Lots of Koi/goldfish, a catfish and several other things. More pics/info here if you're interested:

https://www.houzz.com/discussions/new-house-came-with-great-koi-pond-debating-how-to-handle-maintenance-dsvw-vd~2940057

There are a few I'm curious about. One, is sorta brown in color with kinda blue vertical stripes, or nearly strips (the one without the arrows in this picture). The ones with arrows are all just little grey fellas:

Then I've got this other fella I'm curious about. He's kinda a bronze color and in the right light.. sparkles a little gold, easiest to see in the fins:

Here they are together:

Apologize for the pictures, it's real hard to get good ones. I can do better though if needed. Let me know what you think!