I'm brewing a 5 gallon batch of a red ale. Used S-04 for yeast. Fermentation started within 24hrs like normal and everything appeared fine. Still does in fact, aside from the fact that fermentation hauled quite quickly seems to be quite sluggish. It's a little over 72hrs since pitching. Just did a hydrometer reading and it's at 1.020. So still a little ways to go. Do I leave it be or should I add a little Fermaid K (1tsp in room temp water) to kick things up a bit?