Oxygen bubbles in tank

[nicodemus]

I recently set up a Fluval 404 canister filter in my tank and the output hose has been putting out water that is extremely oxygenated. On the opposite side of the output, the tank wall is covered in bubbles. Is this a problem with the filter or the water in my tank? What causes water to become "bubbly".

 

[thangbom]

perdy shur it's the filter... is the water return to high in the tank??? cuzz somethimes it can make a veturi effect like and pull oxygen underwater and making bubbles....

 

[nicodemus]

The higher I set the flow, the more bubbles appear. but even at the lowest levels bubbles still show up. However I think your correct about the venturi effect. Any suggestions on how to lower it? My water return to the tank is at a minimum level. Thanks