Thanks, BigB, that was very helpful. Brew day went off without a hitch, apart from dropping my hydrometer and having to run out to buy another. The "sound of victory" this morning was a bit louder than expected, however: krausen forced its way into my airlock, clogged it, and eventually blew the lid clear off my primary bucket. I was able to rig a blow off tube using part of the airlock and the siphon tubing. Crisis averted for now. Fermentation was active enough that I hopefully won't suffer any serious contamination, but final word on that will have to wait until I bottle in four weeks. Thanks again!