SO this is like my 10th batch, first partial mash. It was a Belgian Wit with Wyeast 3944. Bag swelled and used AHS yeast nutrient per directions. Didn't have enough time to do a starter so I just pitched one bag with yeast nutrient. Today I checked the airlock and no activity at the 18hr. mark. shined a light on the out side of the bucket and it looks like there was some krausen that rised and fell. My question is what happened? Did I... 1. Have a leak and that's why there's no airlock activity? 2. Get an infection even though I'm super meticulous? 3. Just have a super fast fermentation?? Thoughts and advice what to do?