I miss my old tank setup with vampire tetras, but yeah, Im leaning heavily towards an asian arowana setup...and I could use the "luck". I know they are comonly kept singularly but that would bore me and the tank will be roomy....at either 600 or 800 gallons. Probably go with 6 of them and unload 3 of them as they reach a respectable size,(or just keep em all, time will tell).(Im sure some business man wanting a pick me up would be happy to take them off my hands) goin with arowanas will tempt me to make the tank deeper(I can always take the sliding glass doors out to move a 40"-48" deep tank into place, that would bring her up to 1000+gallons.)