05-06-2010, 04:39 AM
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I would ventilate it. If there's that much condensation, I'm guessing the water level is up to that center brace so the air is effectively trapped under the canopy on the right side? If so, that means there's zero oxygen exchange happening on that side of the tank, effectively chopping your surface area in half, which isn't so great for your fish.
That said, too much surface agitation will promote a lot of oxygen exchange, forcing out CO2 in favor of oxygen, which isn't good if you aim to have a planted tank. For that reason, you usually don't want to run any sort of air stones or air pump powered decor in a planted tank during the day time (at night it's fine, though).