I'm sure you guys are sick of the n00b fermentation question (I searched the forum, honest) but here it goes. My main problem I think is that I didn't take a OG measurement before fermentation, this is my first batch and I wasn't thinking. What happened is this: I didn't aerate the wort after it cooled, again I didn't know that I needed to, but I only boiled 2 gallons for the 5 gallon batch. 3-4 hours after adding the dried yeast, the wort was showing solid signs of activity (bubbling once every 3 secs), 12 hours later the airlock had slowed to about once per minute. 24 hours later, the wort was showing no signs of activity and hasn't for the past 3 days (by no activity I mean no bubbling air lock and no foam, things are starting to settle towards the bottom too). My current SG measurement is 1.021 and I used 6.6# of Amber LME in the recipe. What do you guys think, is it stuck? If so, what can I do to get it going again?