i play as a scholar and i ALWAYS invite the tank to my party(if he isnt already in one) and let my Eos/Selena heal the tank wile i put on DoT's
if needed i heal the tank my self.
dont get why ppl just dont ignore the tank when they got heals.
if you are a healer class you should ALWAYS fokus healing but you can always toss some Stones or DoT's on the boss to add some DPS