There are aquarium chillers, but they can be quite expensive.

If you are handy with tools, you can look on YouTube for "DIY Aquarium Chiller" and find a few inexpensive methods to make your own. Just be sure to look into thermostats to control your chiller.

Another option is to use a fan blowing over the surface of the water in your tank. Evaporation will cool your tank several degrees. The downside to this is that the temp will vary with your room's temp and humidity.


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