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The Propeller Breeze 3 fans are not a bad idea. ;)
https://www.aquariumcomputer.com/products/ghl-cooling-technology/aquarium-fans-propellerbreeze/

Hi there,

On a ProfiLux 4 system you would need these items:

Any combination of 3 GHL level sensors; float or optical
3 matching sensor brackets for the float or optical sensors
Level...