If one of your shammies is dual-spec, both Elemental and Resto...
I'd have that one drop the mana totem.

You'll likely want to round-robin some of your totems, especially Tremor Totem for the fear break.

Dump down 4x Fire Elemental, when you need the burst/AoE support.
Remember you can go 4x Fire Elemental and 4x Earth Elementals at the same time.

Beyond that, try to have each buff or totem accounted for.