Some people make acrylic 'covers' to put over the injection nozzle but I just took a piece of paper towel and foled it up and put it over it. It'll get wet and muffles the noise wonderfully.
I replaced mine once in a while.
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-Mark
29 Gal Bowfront w/24" LED Lights. DIY HOB Sump (5.4 Gal) MP40. Orange Spotted Watchman Goby, 2 Clownfish and a few hermits.
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