[caferacermike]

Who, what when, and where? What bubbles? Are they in the return from the sump? Is the sump loaded with them? Is it from the tank itself? Take a look at the trap Steve made for his sump just before the return pump. A very standard set up.

 

[caferacermike]

You don't need a sponge between the traps. the traps force the air to rise out of the water. Putting a sponge in there is one more thing you need to keep clean.

 

[caferacermike]

your return pump area needs to be free of bubbles. the trap goes before the pump.

 

[caferacermike]

You can mock it up with some tight fitting plastic or whatever. The gap between them should be about 1/2". The skimmer side should be about 1" above the bottom and the pump side should be 1" lower then the top of the skimmer side plate. the top of the skimmer side plate should be the depth of the sump, what ever you want it to be.