not little clowns. Don't trust them.
Re alphaeus randalli, that is the candy cane pistol shrimp. They're calling it red banded in the ad, and now I see where some of this craziness is starting. There is a huge and dangerous difference between stenopus hispidus (coral banded) and alphaeus randalli (candy cane). For those of you unfamiliar with the Latin scientific names of specimens, here's the skinny: if the first names given aren't identical, they're NOT close. You'll find alphaeus bellulus (tiger pistol), etc, and all the alphaeus guys are pistols. The stenopus clan aren't: they include stenopus hispidus (coral banded), stenopus scutatellus (golden Caribbean boxing), stenopus tenuirostris (blue boxing), etc, etc, and are generally called 'boxing' shrimp because of their wide-armed, pugnacious and dangerous come-on.
So when in doubt, google the Latin name: that will give you pictures, that will give you habits of the family cousins, etc, and that will give you a good idea of whether you want to invite this clan into your tank, and what the downsides may be.