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I usually try to cull obvious wrongs in the tank they are living in, that at least eliminates the dropping colour from stress and change of water parameters. I usually also have a couple of the nifty cheap 20L glass tanks laying about and I set one of these up on a table with some plant life and a light (or where it will get sunlight) and leave the shrimp to settle in this tank for up to a couple of days even a week and then I sort desired and undesired. If you only have one tank for the shrimp your biggest problem is going to be where on earth to put the undesired or cull shrimp, not such an issue if you have some semi aggressive fish that may eat them or like in my case having a large pond that culls can run wild in with some native fish like gudgeons that I know gladly scoff any shrimp they find. If you have large numbers of culls you may even be able to tempt a local pet shop into taking them off your hands and depending on the grade of cull they could sell them on to other fish keepers or sell them on as live food. I have had some issues with breeding black cherry's. At one time I got some dark chocolates and planned to selectively breed them back to black. The plan was working until I noticed the shrimp numbers in that tank where decreasing instead of increasing. It was a 20L open topped tank in my car shed and a dragonfly had laid eggs in the tank. So dragonfly nymphs where having a feast. After that experience I tend to always keep relatively docile or small mouthed fish with my shrimp because I know the fish will eat the tiny dragonfly eggs or newly hatched nymphs just like they do any mosquito eggs/ wrigglers. I then started again with breeding the chocolates and now have a tank that produces almost 100% black cherrys and only occasionally do I have to hunt out wilds or chocolates. Even the occasional red will even still turn up but rarely. Recently I even got a couple of blues out of this tank. I would attach a couple of pictures of my blacks and chocolates but have been really struggling with the new size limits of photos and resizing my pictures.