I always begin with quicker heals, and then watch the tank interact with the mobs and learn his rate of hp loss. Always put best hp buffs on the tank to boost hp (as was already stated), so it's more mana efficient. Eventually, it'll be routine for you to group with someone, watch how their hp dips with the mobs, and time CHs. I've been in groups when that's been between 25 and 50% hp. Subtle, but I always have mana.
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