Tank Mate thoughts/ideas

Currently my tank is in the dining room, but shortly we will be knocking out a wall and the tank will be moved so that it is more of a feature between the living room and dining room.

Currently in the tank (72 x 30 x 26") I have my marble pair and 4 red hooks. Im looking to add something else to the tank to add a bit of colour and movement when it has moved. So far on the list Im considering one of the following options

A couple of Peacock Bass
A couple of Bay snooks
A single Dat

Im not too fussed on arowana. Are there any other suggestions?

Currently the rays are 8-9"

Not a massive severum fan and Geos tend to stay near to the bottom, I m looking for something that will be mid to upper levels of the tank.

ATF or Tarpon are some other thoughts but not sure how an ATF's aggression would be as it got bigger.