Lots of summer time tanks running a little warm judging by the threads here. If you are missing your target temps by being a couple degrees high or need something that you can run off of a small battery bank in case of power outages, this is a simple, cheap and effective solution. I'm sure it's been posted here many times.
Here are some links to what you need.
120mm computer case fan. I spent a little extra for one lit with an LED so that I could see when it was on.
$10 - 120mm case fan.
Cooler Master SickleFlow 120 V2 Blue Led Square Frame Fan, Air Balance Curve Blade, Sealed Bearing, 120mm PWM Control for Computer Case & Liquid Radiator https://a.co/d/7rWiMCI
$10 - DC power supply.
LightingWill LED Power Supply, Power Adapter, AC 100-240V to DC 12V Transformers, Power Supply for LED Strip Light, Output 12V DC, 1A Max, 12 Watt Max https://a.co/d/hj3HrOl
$20 - 3D printed fan brackets
Aquarium Fish Tank Cooling Fan Hanging Brackets set of 2 Brackets - Etsy
This Aquariums & Tank Decor item by LeafgreenSolutions has 35 favorites from Etsy shoppers. Ships from Clive, IA. Listed on Feb 6, 2024
www.etsy.com
That's it.
You can automate the set up by adding an inkbird ITC 308 with a cooling port.
$50 - inkbird
Inkbird WiFi ITC-308 Digital Temperature Controller Aquarium Thermostat for Aquarium Heater and Cooler, with Waterproof Sensor https://a.co/d/a7vMcRs
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