Originally posted by RobChuck
The peppermints, scarlets, and fire shrimp will all get along fine at the quantities you mentioned, and a CBS will likely be fine with that mix, but there is a chance that it could get aggressive and kill the other shrimps.
An extremely good chance,
The only time I would add a cbs, is if I am ready to plan on it being the only shrimp i have, eventually. In large tanks, sometimes they do not bother, but generally they will. These guys are so aggressive taht they have been reported to actually try and bully lionfish, other shrimp are definietely in danger of this being a probability.