I don't know about which one breeds true. You will want to pull badly colored ones no matter what keep your colonies looking good.Thanks for the suggestions. Maybe one day I'll do a skittles tank, but for now I'm going to stick to a "clean" look with one colour.
I'm still in the process of making my decision though! Right now its bloody mary, painted fire red, sunkist orange, carbon rili, blue velvet or blue dream.
I know it has a lot to do with how they were bred, but of these colours which one tends to breed the most true? I've heard bloody marys will throw way more colours and culls (excuse my ignorance, still learning shrimp lingo) than painted reds for example.
If you want some incentive one way or another you could go with the orange ones to match the orange of the newt bellies, or you could go blue to provide a completely contrasting color. Just my thoughts.