'Ard ta Feed is a very straight foward tank an' spank. He does nothing but hit the tanks and spew forth green goo from his head cavities. The green goo is an area effect that seems to have a very wide range... but even if it hits your party, one healer to keep the tank up and one healer to keep the party up should be plenty.
The main challenge in facing 'Ard ta Feed isn't him - it's getting the proper level and then killing all the other bosses to gain access to his chamber... but he's essentially a loot pinata.