my second batch is an IPA made with 6 lbs of DME and columbus and citra hops. the guy at the LHBS reccommended dry hopping with the citra but I forgot to ask about dry hopping in the primary fermentor since I do not have a secondary. Its been fermenting for a week and I threw in a 1/2 oz. of the citra to dry hop, I plan on leaving it to ferment for 2 weeks. I haven't seen any activity from the airlock, but I pulled the airlock out for a second and saw the krausen on day 4, so I'm not worried about it, but I could really smell the hops!