Brewed a batch of cream ale from concentrate in January. It tasted great for the first month or so but the flavor went downhill after five or six weeks. Not disgusting, but not nearly as good. This was my very first attempt ever, so maybe something bad crept into the process. I thought I was doing pretty good with directions, sanitation etc. I racked from primary right to bottling bucket and bottled immediately. Could this be the work of evil oxygen? That's it in my avi, btw.