I have a 500 gal pond with 3 peacock bass (12-14in), 3 motoros (8-14in in diamater), and an 11in redtail cat. The redtail was a rescue that i will be rehoming in the near future. Currently I am in the hunt for a single larger fish to add something new to the tank. I've never had luck with arowana and i would prefer to stick with fish native to S. America. Any Suggestions?