Suggestion...make sure the return flow is aimed away from the intake supply tube. The returning water "splashing" into the res where the other tube is located will help push air bubbles to where the pump supply tube can suck them up and into the system.
You could always stick the fan section of a small gutted heatsink fan on an axle right at the return to make a cheap flow meter and have the return tube under the water lever for no air bubbles.
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