I have seen shots of Tropica's setup, but I did not know that FAN used the same kind of thing. That would be easy enough to set up. You probably wouldn't even need to button it up so tight. I have found with aquariums that so long as they are 90% or so covered the air space stays quite moist. That is right I maintain humidity in this tank by covering almost all of the top with a canopy. A disadvantage of this approach is that whenever the aquarium heater is running and the tank is warmer than the room the glass becomes quite foggy on the inside. Right now we are having warm fall weather, so I turned off the heater and the glass is clear again.
Of course there are certain plants also that do best with drier air. If kept in very moist air Echinodorus swords and some stem plants will respond as if underwater, developing very soft and flimsy immersed-form foliage that doesn't grow right. These are better kept with more air circulation.
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Hydrophyte
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