they should be fine unless the front is WC (greatly different water parameter requirements). if it's truly a cuban, that would be sweet. i just hope you have the correct sized tank.
The Frontosa, whether wild caught or captive bred thrives in PH higher than 8. It is not a suitable companion for an aro , that is an acidic wtares dweller.
Also you need to see if sizes of all of them are compatible. And I do not know the size of your aro.