I brew 10g batches but split them in 2 fermenters. I try at every step in the process to make them as equal as possible. Back and forth from the brew kettle, the same aeration, same amount of yeast. I am really amazed at how differently they ferment. More so this time. 1 of the carboys is really milky looking in color and maybe a day ahead of the other one. I am sure the milkiness will settle out. Just odd, I will take a picture tomorrow if it still that way.