There shouldn't be any real difference between keeping a Rotkeil and a standard Green "Severum", as current opinion places them as different populations of the same species, Heros efasciatus.
Beyond that, I'd leave out the convict, as singly they just have a naturally aggressive nature that makes them a hazard, even to much larger fish. The tank would eventually be too small for all of the other fish, as the 72 is barely big enough for just the Rotkeil OR the JD, with possibly the Pictus cat. Firemouth is mostly bluff, and might be alright.
Happiness may be the door to Heaven,
But Pleasure is not the Key.