I have 2 in a 10 gallon tank with a few cherry shrimp and some young gertrude rainbows. The tank is heavily planted, but they've not been even remotely aggressive toward anything but each other. Even that is minimal and more bark than bite. Sounds like I may be lucky in that regard though!
I quite enjoy mine, and really don't do anything special for them. They eat the same stuff the shrimp eat, don't mess with my plants, and are quite entertaining.