Yes, the pic helps! I think you made your sump too short in comparison to the height of the equipment.
Quote:
Originally Posted by Reef Pilot
You could add an 90 degree elbow fitting to your return pump with the opening pointed down to allow a lower water level if so desired. I had to do that with a return pump to avoid it sucking air.
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I have this on most of my pumps so they can have lower water level.