Cider problems

[Ciderhead]

I made about 23 L of cider last week. I tastes great, and no issues in the bottle. However, I had about 1L left over in the carboy, and I was going to add more juice to it to make another batch. When I went back to the carboy (which was sealed with a water lock this whole time), there was a weird white film on top. It looked almost like cream that spread out from the middle of the carboy. Any idea what type of contamination, if any, this is?

[Dirt Chicken]

Ahhh, the throw it out kind!!

[Ciderhead]

Haha, well I tried a taste, and it tasted fine, but there was definitely something growing on the surface.

[mr x]

Doesn't sound good.

[homebrewcrew]

Yeah I don't think I would mess with that. Pour it out