I am kinda lost you added a tee so you had a vent above the water line off your drain? I have tweaked with mine a lot to get it silent. i would remove the tee and just have your drain under water with the venting in the standpipe.
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360 gallon sps reef, 180 gal sump, bubble king supermarine 300, 4xmp40Wes, 2 x 6215 tunze waveboxes, 4 ghl mitras
360 Reef Tank
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