I use stopcock grease (spare me the comments, I've heard 'em all !). That is just a pure silicone grease made by Dow Corning for use in labs. It's inert and won't hurt anything.
While you can often get away without anything, it is better to use silicone grease for a better seal without binding, pinching and with a LOT less pressure.
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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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