YEs, fans seem to do the trick for me in my vertical tanks. All I have is screen opening at the top of the viv with a fan on one side. Air I suppose comes in at the bottom of the tank through small gaps between glass plates. And I have the fans blowing air out. This keeps the front glass fog free even without the fan on.
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All that is gold does not glitter,
Not all those who wander are lost;
The old that is strong does not wither,
Deep roots are not reached by the frost.
-J.R.R. Tolkien, LOTR, Fellowship of the Ring
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