Eventually all the shrimp will revert to brown if they breed outside their own color. That's all that happens. If you like Malawa shrimp they look sort of like them. I happen to like it.
I use a piece of airline tubing so I have more control. I keep a finger over the draining end so if I accidentally get a shrimp I can block the output before they wind up in the bucket.
If your dog thinks you are the greatest do not seek a second opinion