He asked a question, he has an extremely large tank compared to some members on this website. He is obviously responsible and just wanted some advice. You dont have to jump down his throat for asking a question. Some people seriously need to develop some social skills in this forum.
Regardless. Getting a pair of Pima would be a "life decision" the pair will outgrow your tank by themselves in less than 2 years if fed correctly assuming you remove your aro / pacu stock. Assuming you'd move them to a pond after they grow is a fantastic idea assuming you have a pond with a floor space of at least 12-12-# blah blah blah. They get massive, and do jump (as you indicated), and making a "jump proof pond" of that size may pose a problem.
All in all pima's should not be owned unless you are fully prepared to house a fish of that size. id say maybe 1% of MFK could honestly house a full grown one. On a side note, be careful of that RTC with 8inch aro's, I know for experience an 8 inch RTC will fold a 12inch+ aro to eat, just keep an eye on him and use your best judgement.
cheers