My return on refugium make too much noise

[Nateaqua]

Hello, in the picture is part of my sump, I have a chamber in the top part that acts as a refugium, it’s feed by a sicce 1.5 pump for the intake. The output is a 3/4” elbow with a hole drill in the top corner of it, was trying to get air out, ended up main it worse. I end up plugging the elbow with a straw was making to much noise and adding to much air bubbles out of the output. As you can see in the picture air is getting pull in causing to make to many bubble into my main sump area. I am more concerned about the noise it makes and would like something more quite, is there a better design that would cut out the noise 1st and cut out on the bubbles also?
Last pic is overall sump pic, I took a old sump and diy it to have 3 chambers. I do not get bubbles in the DT.

 

[TheBear78]

Is the noise coming from entry into the outlet? (the threaded black section)
Have you tried angling the return pipe ie. rotating it around the bulkhead whilst still keeping the bottom end below the waterline? This should dampen the splashing to some extent.

 

[Nateaqua]

That did take most of the noise away and reduce the bubbles by 50%, even better the bubble are now in the back were I do not have to look at them anymore. Thank you