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This shows how a small vac-pump can also re-cycle air from the partial vacuum at the top of the upper aquarium.
Continuous Fish tank Vacuum filterby thejanitor
Powered gravel vacuum for aquariumsby janelj
DIY Constriction Airlift Pumpsby gaiatechnician
Air Pumpby visan.chai
New To Fish Aquariums?by gi_joe77yo
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