For fester we do it liek this.
Our tank, usealy a pala or dk stands somewhere at the end of the room. When the first disease hits that person walk to the waiting tank, gets dispelled and stayes there untill number 2 comes. The adds merge and then the tanks starts kiting. Make sure to avoid the spit, its really easy and it can actually kill you if you get unlucky. When the ooze explodes everyone followes the tank, the ooze tanking tank stands outside of the raid, waiting for people to bring the small adds to him.
Hope this helps a bit ^^