I brewed up an 10 gal IPA this weekend. I racked to 2 separate carboys and pitch with separate yeasts . One is Wyeast 1968 and the other is a cultured Bell's yeast. The 1968 has slowed, but the Bell's is still fermenting like mad. Why is the color so different? One carboy is shaped differently, but the color is the same as the diameter tapers. The carboy on the right was filled first after wort was chilled with immersion chiller.