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Coolworks Ice Probe http://www.marinedepot.com/CoolWorks_Ice_Probe_with_Power_Supply_Micro_Nano_Aquarium_Chillers-CoolWorks-CW1111-FICHMC-vi.html 6-8degree drop from average room temp per probe per ten gallons of water. Check it out.. The above DIY chiller is said to have costed 175$. I've...