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A coturnix is a coturnix, and they are by far the most brooder friendly game birds on the planet!
4 week old coturnix roos should be ready for their big boy pens. They are teen-angers on steroids and the hens soon follow. The Tibetans (Rosetta pattern) and even the wild/brown patterns tent to be a bit more (flighty) than other colors, but, a coturnix roo of any color/pattern is a force to be reckoned with. They can actually sex your non-color sex-able birds long before you do.
I would also like to stress, that what one person sees as an "Attack", may be normal pecking order, or breeding behavior in coturnix.