Today I plugged in my Eshopps S-120 for my new tank and it’s not producing any bubbles. You can see the pump moving water around, but no bubbles are coming up the neck. I’m not sure how to post videos but here are 2 pictures.
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Blow on the air intake to restart the air suction in the venturi. This seems to be a common problem on the restart of the smaller Sicce pinwheel pumps.
I have an Aquamaxx ConeS Q-3 and I have the same problem! this seems to be a normal problem with this pumps.

