The way my FC does this fight is we kill the one that spawns closest to the tank first doesn't matter if it is red or green, it will be dead before the far one even gets to the party. We also 1 tank it because we found it pointless to bring an offtank to tank an add that hardly hits for much damage at off. 1 tank 5 dps 2 healers is the best set up for the fight. Now then for the center adds we aoe LB they are dead. We usually don't get a 3rd set but if we did we still kill the one by the tank first. This fight color doesn't really matter at all.