I'm in a 10 man semi-casual guild.
We used 3 healers (Shaman/Disc/Holy Priest) and consistently wiped at 40-50%. The Fatboss video guide suggests to not kill any frost heads however the tanks were taking a lot of damage and the amount of movement required to dodge the venomous head's bolts was proving tricky for our healers (as well as the damage from the explosions).
A friend in a better progressed guild has suggested we kill fire -> frost -> fire -> frost -> etc. (like they did) and not kill any of the green heads, would this be better?