I've been thinking about purchasing an Arowana but not sure which to buy. I live in the States so my choices are limited. Considering either a Silver or Black. I really like the Black Arowana but I've heard they lose their colors with age.
I love my African aro. Closer to a arapaima but it is great. Tough as nails, air breather, eats leftover food and detritus. Just finicky under 8"
If South American I'd go black. If Australian I'd go leichardi