Convinced my LFR group to try an unconventional strat on Durumu...and it worked EASILY.
Basically, you want to stack on the "wrong" side of the laser beam. You can then sit there the entire time while the beam works its way around. Then your stack group has to move a bit at the end once them beam gets around.
The damage from the purple fog is EASILY healable (but be sure not to be stacked in a puddle).
It is the laser beam that wipes LFR. Not the floor damage. We actually still had color beasts up during it and we still lived..
What I did was two /yell macros:
The first "/y Stack on me"
Get on the wrong side of the laser beam, spam that a bunch, the raid will move to you. Don't be super close to the laser beam because people who don't stack fully will get hit then.
Then, when the beam works its way around and is going to catch up, move away from it and spam:
'/y Now move a bit over here, keep trying to get to me"
You'll kill the boss in 1-2 attempts.