It's not entirely out of the question to run 5x Elemental. The biggest drawback I see against them right now is that you can't use the dungeon finder tool to queue random dungeons or heroics which means a lot less badges when farming. I really hate this as my shammys can clear heroics faster than my DK/ret team.
Like the others have said, any tank will work. I've used the following tanks with my shamans: druid, paladin, and a DK. The paladin was by far the easiest as everything sticks to him like a magnet. With the DK and druid, I would regularly have to taunt the mobs to keep them on me. The paladin also seems to be the easiest for setting up a /click rotation.
If you're hellbent on gearing 5x elementals, I would stick with the plan and queue randoms with 4 of them at a time and pick up a random tank -- at least this way you're getting the extra badges on 4 of them (assuming heroics), then just swap them around. 4 eles can provide plenty of heals for tanks in about every heroic.
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