Ok - the standard 180 gallon tank - 72" x 24" x 24" will only allow you to keep a shark for a short period of time. But for either a Wobbegong or a Horn shark you are going to need a much bigger pond/tank when it out grows the tank.
Generally you want a tank that is large enough to allow you to be able to keep a juvenile shark for a minimum of 1 year before needing to upgrade.
With a 180 gallon tank - you need to upgrade to larger tank by the time the shark reachs 18-20" in length.
This means you want to start with a juvenile Wobbegong or Cali Horn shark that's under 12" in length.
