Noisy sump drain


The Tang Herder
So I've got a pair of Durso standpipes on my tank ( the standard AGA plumbing kit) and the overflow itself is super quiet - but I can hear the drain lines emptying in the sump pretty much anywhere in the house

I've tried dialing back the return pump and that didn't really help. Both drains terminate about 4 inches under the water line in the sump.

Is there anything else I can do to quiet these things down? It's starting to drive me nuts
I have not, the way the lifereef is designed a filter sock would be difficult. I assume the idea is to use the sock to collect the bubbles / air as it comes out of the drain lines to try and quiet things down?