08-17-2007, 01:06 AM
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Unfortunately, most of the ways to cool down a tank have a price tag.
If you have one in the same room as the aquarium, you can leave an air conditioner on all day, but your electricity bill will suffer for it. Many air conditioners have settings that automatically regulate the temperature of a room by turning on and off when necessary. Using such a feature may reduce the cost.
You may be able to cool the tank down by aiming a fan at it, and I imagine this would use less electricity but I really don't know.
If your aquarium has a hood that either flips up or is able to be propped up on hinges, doing that may allow the water to cool off a bit. We used to do this regularly to cool down our reef tank, but stopped when we found fish on the floor afterwards :(
There is always the option of an aquarium chiller, though its cost dissuades many from going that route. The chiller is like an air conditioner for the aquarium - a water conditioner. The advantages of buying and using a chiller vs. leaving on your air conditioner would be much more precise control over your water's temperature, and I imagine it would use less electricity as it would be regulating the temperature of a small volume of water vs. an entire room's worth of air.
I hope some of that helped. I'm sure that members with more experience can offer other ideas or elaborate on some of what I mentioned.