The Herbie drain is my favorite. I did on my last 2 tank builds 180 and 150 gallon tanks. Completely silent. However it requires 3 holes in your overflow
The Durso drain is a good way if you have 2 as a next best option in my opinion
Lastly. You could use a Maggie muffler as an alternative to the above...
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150 gallon all custom and brand new
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