Wow a mighty active fermentation you had there! Looks neat. And doh, it does look a little less filled than my 6.5 gallons carboys that are filled with 5 gallons. Funny story. I finished primary fermentation on a hefe and kegged it while brewing a jack o lantern to fill the newly emptied 6.5 carboy. I had marked the 5 gallon mark on the outside in 3 places with a sharpie marker that seemed to not rub off. While letting the inside soak in one step and star san I went outside to attend my brew. My sweet little ol' mom found it soaking and decided to be helpful by cleaning the carboy inside and out. I came back inside ready to dump the sanitizing solution out of the carboy and dump my beer in. Mom proudly presented my my thoroughly cleaned inside and OUT carboy (now void of its 5 gallon marks

). I didn't have the heart to tell her so I thanked her very much, took it outside and refilled and marked it again. Made me chuckle. Good luck with your brew!