I would def say he would be outcompeted at feeding time.
Aros eat like little Pbasses and Tats are picky eaters. You starve an Aro for about 2 days, he might eat the sand

ROFL

. Tats will starve until you "Break them off live foods". Im sure the keeper will have a certain amount of food to feed daily so I say the Tats eats dead last. Tats are not as aggressive eaters, even compared to the Juru. My old Juru, once he smelled food in the water, he was hunting and scanning. Same with the Aro, he would (still does) follow me and waits for food. My old 3 Tats would run for cover and I starved them (on off ) for about 3 months to wing them off live till All-Happy did it for me.
I think the combo would look good except for the eel