Overflow Gurgle and Sump sounds

[AbsoluteAmateur]

I recently set up a 90 gallon sump tank with 30 gallon sump underneath and there seems to be a loud overflow sound. The overflow pipe is submerged in the sump, I could use suggestions on what I could do to make it quieter. If I need to make adjustments to the overflow head or the overflow piping let me know :)

 

[blaxsun]

Where is the gurgling originating from? The overflow on the top, the sump in the bottom or both?

 

[AbsoluteAmateur]

Where is the gurgling originating from? The overflow on the top, the sump in the bottom or both?

Overflow on top