Here's a pic of most of my fish. I don't feed them much so they don't get that big. The biggest one is that spotted white/grey/black one. He's about 6 inches long from 3" when I first got him. But not only longer, he's gotten a lot fatter.
The two gold ones on top are also koi. The pale ones with the red dots on their heads are feeders. They were tiny when I got them last year. The big black one is a feeder who has grown 2-3x as big as another feeder we got at the same time.
The two orange ones on the right are feeders we got this year.
The big orange and white one in the middle is a Shubunkin that really grew a lot just last year. Same thing, all these fish are not just longer, they are a lot fatter.
Also, you can see a lot of algae fuzz sludge at the bottom. The water is absolutely clear, hard to see on this photo. Not sure of the sludge is from the sludge eating stuff I've added to the pond because I usually don't have that after vacuuming.
I have 5 koi ( 2 of which are butterfly, 1 solid orange ogon, and one is black with white markings) 2 blue shubbies, 2 comets, 1 black goldfish and 3 goldfish from a festival. Lots of minnows rosey and silver/black.
