OK, so I brewed up an extra pale ale and pitched yeast 9 days ago. The OG was 1.050. I used a Wyeast Activator Pack British Ale II and the wort was well aerated and at about 70 degrees. I placed in a dark closet that is set to 68 degrees. It took about 24 hrs to start seeing signs of fermentation, then it went crazy for 8 days. Yesterday, I did not notice any activity, so I took a gravity reading and it was only 1.020. I thought that it would have for sure been lower than that for as much activity as I was getting. I will probably take another reading tonight to see if it moved any. How much longer should I leave it in the primary? Is there anything I can do to get it to start fermenting again?