Go looking for some Vietnam Kamfa. They're the only place where I've actually seen dark or even light purple fish coming out of. Although Classic Kamfa from Thailand does have a hue of purple to them which is rare. Most Classic Kamfa from Thai will be red/pink/orange/yellow. Thai Kamfa does come in purple as well, but not easy to obtain such color. Other than that, the RBK(Rainbow King) is the only strain that has the most purple like hue to them...