Chad, like sparky said, if you don't mind the feeding and restocking, your pond is a nice size for the HBG. Just like you mentioned about "what are your goals", you will also want to consider years down the road when your young boys are not so young. At a half acre, even a complete draining/restart won't be oppressively expensive if ever warranted.
Have fun, play with the species! It's YOUR pond!
