Started my first Tartine starter yesterday- and it took off! Doubled in volume and bubbling in 30 hours. When do I feed it? Doesn't fit any descriptions of any posts I've found. Tartine talks about feeding on day 3 or 4 when it is barely bubbling. Don't want to mess this up. do I feed now or wait till it starts to subside? My house is a consistent 72 - 75F.