Wait anyone know if the Red tail Golden Arowana is considered asian, or one of the illegal ones? That one may be my favorite. I feel like the Red aro's (even tho illegal to get anyways) are only red under pink/red lighting??
Your options for legal arowana species are:
Osteoglossum bicirrhosum (silver arowana)
Osteoglossum ferreirai (black arowana, blue arowana)
Scleropages jardini (Jardini arowana, Australian arowana)
Scleropages leichardti (Leichardti arowana, Australian arowana)
Heterotis niloticus (African arowana)
Anything else you see (aside from color variants like platinum, high shine, xanthic, and melanistic) is an illegal Asian species.
And before you purchase anything, make sure you have thoroughly researched its needs. The smallest species in this list are the Scleropages species, and even they require a very large aquarium footprint (something along the lines of 72" x 30" or larger).