It's not the screws you need but something to go between the fan and the housing. Go to the craft store or walmart or something and get a sheet of thin foam and cut out a pice large enough to cover the outside of the fan, obviously with a whole in the middle. Or easier to do but a little more messy is to get some silicone and put it on the outside edges of the fan carefull not to get any inside to restrict the spinning. Then remount the fan using eaither method.
The silicone or foam will act like a gasket and dampen any vibration.
Cheers
Todd
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75G, 100 lbs LR, Inwatter Stingray LED's, 25 Gallon Sump, 24wt UV, hermits, Snails, pep, fire & cleaner shrimps, Blue Throat Trigger, Perc Clowns , Yellow Tang, Coral Beauty, Blue Regal tang, RBTA, Coral Banded Shrimp, Checkerboard Wrasse, Many Corals, Royal Tux Urchin
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