I've "made" some really red white cloud minnows
Every couple of years I take the prettiest handful of my white clouds and remove them to breed. I originally got this batch in around 2008-2009, and have been kind of
selectively breeding them (not very strictly). The last few years they have colored up a ton from what is in my profile pic. The males have more salmon red color and it shows up best when they are flashing at one another. Nothing too outrageous, just thought it was neat. And hopefully in a few more generations of doing this, it will continue to improve.
Nothing good happens fast in an ecosystem.