I'm bouncing ideas around in my head for a future tank project. I would love to have an oscar again, but have given thought to other fishies. The tank plan is for about a 140 gallons. Wonder if that would be good enough for say two Koi? I know they get large and need a lot of room. The tank plan is to be 5' long x 22" deep x 24" tall. Would like to hear many other ideas for stocking the tank.