Im in day three of my first 5 gallon batch having upgraded from the little Mr.Beer 2 gallon kegs. I chose the brewers best brown ale kit and followed the instructions to a t. I cooked my wort in an ice bath and mixed with clean cold water and pitched the yeast when the temp was around 73 and it sits in a room at a constant 68 with fermentation temps at 71 in the glass carboy. Last night was the second night fermenting so about 48 hours in and the color completely changed. It was a pretty deep brown and it lightened significantly overnight. Is this normal?