The one koi male in the last-but-one picture breeds often with other sunset female I have (no pic.) The black pearl in the first one fights a lot with his mate, but so far has not spawned.
I have in all 6 adults and 6 pre-adults in that tank. Last week I added 6 quarter sized pinoy ghosts and pinoy paraibas in there. I am getting ready to move some of the adults out of the tank since its crowded now.
You have some great looking angles. How many in total in your 125g? Any breeding activity?