I need some help with bubbles

[Chris882003]

Hello everyone I have a WB 20 just set up the tank up with live rock and sand. Everything was fine for the first week. Going on week two I am getting micro bubbles coming out of the nozzle. I checked and I don’t see were air is getting in the system. How much water should be in the pump chamber?

 

[fastest302]

Hope someone can chime in for you

 

[Chris882003]

Found some information from Facebook. The pump was to strong. He changed the return pump to a adjustable one and lowered the flow.