I set my druid 5 group up the same way as Hachoo did for his shams in this video:

Hachoo - DK Tank + 4 Elemental Shamans

I.e., Tank in the middle, casters around the outside.

My setup is one feral, 4 x balance. During this fight I don't use moonkin form at all. Make sure you have Improved MotW / GotW up before you pull - the 75 nature resist is a must for this fight.

1. Make sure Rejuv is up on all toons at all time, even if they are at full health - this is your ghetto healing stream. Use Nourish to spot heal where necessary (Nourish gets a 20% bonus to heal if a HoT is on the target already).

2. At about 60% pop Treants - this is to pick up the boss when he goes into elemental phase, and give you time to initially move your other toons out of the mojo. Have your tank pick up the elemental as soon as possible.

3. During elemental phase make sure you keep moving all your toons out of the mojo - binding keys to make all alts strafe or move backwards / forwards helps a lot here, as you will need to move them several times during this phase. Watch health closely.

4. Burn the elemental down during the 2nd elemental phase - I normally save barkskin and Starfall for this phase, that way you are still doing DPS even while moving.

This is a pretty healing / mana intesive fight - I usually find I need to pop an innvervate towards the end of 2nd colossus phase.

Hope this helps...

Cheers,

S.