If that is the only leakage, it's not what is causing a drop in tank level. What you have there is on the (very) high side of normal (ie, something you want to fix but shouldn't cause any problems other than the way it looks). But the coolant may have drained to a lower area. Inspect lower down and see if you can find more signs of leakage/drainage - if the tank level is dropping, you may find a puddle in the undertray or a cavity on the engine.
The throttle bodies have coolant lines for freeze protection (some ppl in warmer climes will delete the lines).
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