The least amount of healers, more amount of dps possible is best for this..Raid healing will not be an issue.
Basically this fight is REALLY fun, and hectic, amazing.
Essentially, this is a conditional fight from each "groups" perspective. I.e Melee, Ranged, Tanks, Healers, Hunter's. Here it is;
Tanks-
Tank swap at 4 stacks of Rot
Grab Fungal Flesh Eaters
Interrupt Decay
Face boss away from raid during *Necrotic Breath* (Note, if this requires him to heal up from creeping moss to do, it is still absolute..Never face raid)
Bring boss to Living/Rejuvenating Mushrooms
*This is where the condition's come in
Melee-
ALWAYS ATTACK BOSS UNLESS
Mind Fungus Spawns
Fungal Flesh Eater spawns
Ranged-
ALWAYS STACK NEAR BOSS (ON MUSHROOM) UNLESS
Mind Fungus Spawns (Step Away from the raid)
Fungal Flesh Eater spawns
Some ranged have to be assigned to intercepting spores to reduce spore shot raid damage. Therefore those ranged have to attack, unless they need to intercept.
Healers-
Don't waste good mushrooms. If the raid is currently on a Rejuvenating Mushroom, don't heal the next to 100%.. Heal it to 80-90% so we can go straight to it and have no wasted uptime. (This fight is really on the healers)
1 person for every 1 flamethrower has to be assigned to eat BURN the moss
Again..VERY COOL FIGHT.
http://www.mmo-champion.com/content/613