I made a custom hood... It's overboard, but works. A temperature switch turns (2) high
power CPU fans on at 78*F, they have acrylic diverters that push the air across the top of the
tank. This creates evaporative cooling. The fans shut off at 75*F. This allows
me to keep the tank covered to avoid fish jumping ship.
The tank looks like your typical hooded tank:
But when you get up close, you see the fans, and vented light hoods: