Not sure what type of drain you have but the 2 most common seem to be Durso or Herbie styles. Depending upon which you have there are different methods to quiet them. A search for each will give you pictures you can use to identify which is yours and ways to quiet each. Someone with more experience than I can give you better details but hope this gets you started.
welcome to CANREEF
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Biocube 29 est 05/05/08, Koralia 1, 30lbs live rock, ,yellow tail blue damsel, pair cinnamon clowns, baby snowflake eel,Toadstool , metallic green mushroom, assorted zoos , kenya treen
180gall display, 190 pds live rock, virgate rabbitfish,bluejaw trigger, bubblletip anemone,yellow tang, sailfin tang,melanarus wrasse, cloud wrasse,

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