04-24-2010, 04:15 PM
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Cooling a tank can be a bit of a pain. While heaters are relatively cheap, chillers, on the other hand, command monstrous amounts of bucks. However, there are a couple of options:
If the light is the issue, then you have an incandescent light fixture. Florescent lighting does not produce as much heat as a comparable incandescent bulb. Replacing the fixture may be expensive or impossible, however you can get replacement florescent bulbs that screw into the incandescent fixture. You'll find that this helps the heat problem, and brightens the tank as well, as florescent lights release more light per watt than do incandescent (which is actually the root of the problem).
Depending on the size of the bulb / type of fixture, you may also be able to find an LED replacement bulb, which will decrease the heat problem even more dramatically than the florescent will. These bulbs are a little more expensive, and harder to find, but may be well worth the trouble.
If that's not an option, you can get a small, battery-operated fan that you can blow across the surface of the water. This will encourage evaporation, which means you'll have to top off you tank more often, but it will also cool down your water body.