I used Herbie style on my 40 and ran the plumbing 4" under the water line in the sump. The restricted drain draws no air and the emergency barely trickles. No bubbles in the sump at all!
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No you will not, I have mine exactly set up like this unless you are blasting your fuge with flow, which you shouldnt be in the 1st place, I have a valve that controls the flow to the fuge off my return and i have it set to barely trickle water over the edge into the return section, further, after a few weeks to a month a slime builds up further dealing with any bubbles/micro bubbles....both drove me nuts when I 1st set up my tank but after a few weeks to a month after a slime builds up the all went away. I would not recoment any more bubble traps, the pictured design is fine and is exactly what I have with no bubble issues.You are going to get bubbles from the water in the fuge cascading down into the return section. You would prob need a bubble trap on each side.