Squire's 90 Gallon Build, Now With Salt Water

[ensquire]

Issue #2) My durso drain setup is noisy, I know it isn't a conventional setup, but I thought the valve made it adjustable. The problem is the bubbles and noise. While they aren't extremely loud, I just think that I should be fixable. I have adjusted the top air valve and the lower gate valve. The noise from the Gate valve is quite loud if I throttle it back very much. Sounds like a deep fryer in a restuarant LOL I added a fitting to the bottom of the drain pipe, but it hasn't made much difference.
Is there a problem with the design of my standpipe?



Solutions:

1) Make it a Herbie. LOL I would like to make this work though. Just can't dial it in as good as I would like. The noise isn't deafening by any means. skin on stand would probably block it right out.