I've got a hefe fermenting right now. I brewed it on Sunday and used White labs WLP-300 yeast. I made a starter and used a blow off tube and got a very strong fermentation going. After it settled down I put an airlock on it and it's still bubbling every 20 seconds or so. It's in a glass carboy that is in a closed cabinet with the temp at 70F. It stays dark in the cabinet except when I check on the progress. Today I came home and took a look and the smell was very skunky. Is this a normal thing with that yeast or do I have a skunked beer?