Once the temp drops below 160 or so it's a good idea to cover it - dust is covered in wild yeasts, which can cause problems for long term storage. At that point, DMS formation isn't really an issue, so covering won't cause any off-flavors.
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The Fiesty(sic) Goat Brewery est. 2007 & Clusterfuggle Experimental Ales est. 2009
Planned: Fat Man Brown Porter (Pro-Am #2), WLP 351 Hefeweizen, WLP 860 Munich Helles
Primary: Centennial Falcon IPA (Pro-Am #1), sLambic I
Secondary: Flanders Red
Kegged:Himmel un Ääd Kölsch #8, Farmhouse Session Saison Pilot Batch, Chocolate Milk Stout, Pale Ale, Chili Smoked Porter, Berliner Weisse w/ Brett #3
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