Review on 🐠 JANNIDE Adjustable Aquarium Water Cooling Fan - Fish Tank Chiller with 2 Cooling Levels for Saltwater and Freshwater by Krystal Barnes

The fans work great and really help cool the aquarium during a heat wave. Temperatures are comfortable and cool, fans aren't overly loud on lower settings, and materials feel premium. The only downside is that there is no fastening mechanism, the hole is 1.5cm wide and most aquariums have a thicker rim and the screws you use to hold it in place only go halfway, so you have a bit of an error on both ends. Does not fit well in the aquarium. I don't feel there's any danger of it falling, but I'd like to see a proper attachment mechanism for it.