**** yeah looking awesome turtles! Sad to hear about your barra but it happens. Definitely looking forward to seeing it all stocked up!
As for the Mangrove Jack debate earlier I have seen them kept with some things, i've even seen 2 kept together!! Bit it's very rare and they're usually hatchery bred jacks and not wild ones. Wild ones are the meanest things to ever swim inside a tank. I'm going to try and keep my Murray Cod with my Jack, MC is about 2 inches atm and the jack is about 3.5. I'm waiting until the Cod puts a little more size on. Ever think of sticking a few Purple spotted gudgeon or snakhead gudgeons in the pond? They're awesome fish.