micro bubbles coming from return

[An3]

i have a 72 b/f rr with built in corner overflow using a pro clear 75 wetr/dry and mag 7 for return pump every so often i get a burst of micro bubbles from the return into my display its driving me nuts i have the water level in the sump at the required water line
can somebody give me some info on this

 

[HippieFish]

What time frame is "every so often" ? Could either be from a small air leak in your return line, or air bubbles building up in your wet/dry and than being released.

 

[An3]

between 3 and 5 mins.

 

[jun_celis]

The fact is, that your return pump is sucking air. Try putting an egg crate piece on top of the water line where the return pump is actually sucking the water in. It will prevent it from creating a vortex(like a tornado effect). You water might be too low and close to the input pump.

 

[An3]

i actually have the water higher than the required water level

 

[jun_celis]

Hmmm... well, somehow it's still getting air.

 

[An3]

im thinking what hippiefish said about bubbles building up in the wet dry..........but the thing is there are no bubbles where the return pump is but there is bubbles comin in from the drain into the sump is there something i can put on the drain to prevent the bubbles entering the sump