I put an IPA into primary on the night of 3/3. The beer had a lag time of about 8-9 hours and gradually started fermenting increasingly vigorously. Last night it was fermenting furiously. This morning it has totally stopped. Characteristics of brew: The wort is 3.5 gallons, so I pitched slightly (70%) of a full packet of Safale S-04 rehydrated in 237ml water. Pre-boil gravity = 1.051; Post-boil OG = 1.060 The wort water is ion-exchanged through a Brita-like filter. I used no yeast nutrients. The wort aeration was provided by letting the wort splash out of the Megapot kettle into the fermenter. The temperature doesn't seem to have changed dramatically. I've wrapped the fermenter in a blanket. But should I reconsider repitching or just adding yeast nutrients? If so, how much?