I used to owned a green arowana. This is the cheapest asian arowana you can buy. All asian arowana are illegal in the U.S. because it's an endangered species. I still don't undestand why the U.S. Government didn't take it off the endangered list. There's quite of few arowana farms in South East Asia. Majority of the asian arowana are captive bred. The breeder used large mud pond to breed their fishes. The arowana you see at your local petshops are from south america, australia, and africa. I would't recommend putting an arowana with koi fish. Arowana(2-3')+teeth+agressive= messed up koi.