I'd give the jacks their own separate tank. They'll dig up (plants) and eat (smaller fish) a lot of what's listed when they're fully grown, plus brutalizing the angel, gouramis, and convict (convicts are NOT aggressive when not breeding). The best non-herbivore large schoolers that come to mind are one the rainbowfish species and bleeding heart tetras.
"One day...one day, this path will lead us to the White City, and the tower guard will take up the call: the Lords of Gondor have returned!"
–Boromir, The Lord Of The Rings