aquarium chiller - 120 mm fan/8 mm glass
thingiverse
This is a remix to fit on 8 mm glass like my Red Sea Max Nano. Use any M4 bolts longer than 5 mm, no threaded inserts required. I used zip-ties because I didn't have M4 bolts at hand. This thing can easily keep 75 liter tank's temperature 2-3 °C below ambient. I used cheap 12 V temperature controller from Aliexpress and it kept my tank within 25.0-25.2 °C range even with room temperatures reaching 27 °C.
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