my tank is 2.1 x .9 x .75 high and is comfortable with 2 large aros in it
also in there is a jardini and 2 giant gourami
i am upgrading the tank soon to give more swimming room
the 2 you are proposing to keep are still relatively young and small so should be alright together for awhile, possibly at least a year
it will be a matter of trying it but having a backup plan or an alternative tank if things go wrong as they mature
as mystic has said slow moving, steady fish are best
i have had my aros with bichirs, festivum, angels, port hoplos, synodontis, blue gouramis
these are just my personal experiences