I run shaman so I have NR totems, but I think it's possible without. What I do is spread out the shaman towards the back, one on each pillar. Puddles hit only 1 shaman at a time and I can easily heal through that with chain heal.
Your tank should need very little healing, I believe if you put your priest in the middle and use aoe heals you can heal through the 1-2 dps that are in puddles. Your DPS is a little low for the fight so you may have to deal with more damage from the water elemental but I think it's doable.
The problem with moving out of the puddles constantly is you kill the DPS, even with my shaman doing 3-4k each, it keeps the water elemental up too long and I have to deal with way more damage than I should.
I'd save all your cooldowns for the water elemental, the collosus hits hard but you can take your time with him, the only issue you should have is if he lands a mortal strike, but you can still heal through that.
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