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How you will be using it depends mainly on the mobs resistances to the knockback effect.
If a mob IS NOT immune to the knockback effect, you should take party considerations into account when using the ability. Tanks and Melee DPS may find it hard to complete their duties if they have to chase their target around. They can and will complain. In this situation, it is best to use it DEFENSIVELY. Ex: You or another party member pulls aggro and the mob comes running to you. A quick fluid aura will send the mob back where it came from, allowing the tank to spend more time tanking. This is a good way of preventing damage to your buddies.
If a mob IS immune to the knockback effect, you should be using it every time it is up (Offensively). It is great damage dealer, off global cooldown, with no mana cost. You couldn't ask for more. Free Damage!. The fact that is off global cooldown really makes the ability. If you were to cast an instant spell, you can immediately cast a fluid aura.
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Even if the mob is not immune to the knockback and you still want to do some extra damage (Always Be Casting!(Especially when it doesn't put you on global cooldown!(Or cost mana))), there are creative ways to mix fluid aura in. If the target is near a wall, simply reposition yourself so that the knockback pushes them into it. If the mob is low health, use it as a training tool for your tank by pushing it away and telling him that it was time to switch to the next target anyway(It probably was, and the bind effect and your party DoTs will finish the mob). Push mobs in a way that will place them in the camera view of your party, along the path that they are already going. People might still complain but they are making a fuss of nothing. If you are doing it correctly it will speed up the process of killing monsters(Cleric stance helps too!). If you are making it go faster, and they still complain... push monsters in random directions and tell them to shut up and do their job.
Sorry for split and formatting. 1000 characters isn't enough to break down the usefulness of an ability as good as fluid aura
WHM is a perfectly tuned class. Going to give them a bravo for Cleric Stance, Fluid Aura, and Holy.
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A useful combo : Fluid aura + Sleep. Most duty finder DPS can't understand the concept of marked targets and not attacking them. They just press buttons wildly and get off on big numbers. More importantly: They are lazy. If you push the mob out of their camera view, or to a place where they have to go out of their way to get to it, they usually leave it alone. There it will sleep soundly until it is ready. Don't do this if you have a summoner. They excel at doing damage to 2-4 mobs. Everyone else can cry.