« on: June 26, 2013, 07:47:40 AM »
It's a pellicle from something in the dregs you added. It is safe although if you sample some of the beer with the pellicle you might not enjoy the filmy texture. Don't worry, the pellicle will either drop out on its own or fall apart during bottling.
Both of the beers you added dregs from look like they should only have lactobacillus but I don't know that for sure. There may be brett or other bacteria in addition to lacto. I would recommend checking the gravity once a week and see when it stabilizes. Lacto is a fast moving bacteria so once it's run out of sugars it can consume it's done. However, if you keep seeing the gravity slowly dropping week by week you've got something else in there that's chewing up your beer and you will have to make a decision about either bottling it and drinking it fairly quickly or letting it ride until it is stable.