Algae looking goo in Gruet


My experience with sparkling wine is somewhat limited. Is this algae type looking goo normal or cause for concern? There are also some specs/flakes floating around inside. It’s difficult to photograph, but that “tail” part (attached to the inside wall of the bottle) does have a floating motion to it when the bottle is moved. I noticed it on the first bottle I grabbed, so then I checked another bottle and they both have it.