How big are the atf? Malas aren't typically aggressive, alot of the time it's the other fish starting something it can't finish. Aimara comm are becoming more and more common as people are becoming more daring and not listening to all the hype. If you're tank is big enough and you have enough fish so not one fish is getting all of the aggression, you should be fine. Again it depends on the specimen, if your atf are 10" I'd say go for it.DB junkie can give a better response having done it.
The vitts are around the 10 " Mark the smallest is a little smaller and biggest is over 10 but the g is under 9" ! I could just try a little Mala they about 4 ", the tigers just don't hassle the other fish at all, at first they ruined a few dollars/redhooks ate some ditherer barbs and constantly hassled two silver sharks until I removed them, vit on vit is the only agression in the tank.