Slight oil film a problem?

[Nico93]

you are right, it's not a pellicle but i don't think is star san or something like that (because i don't use star san, i use bleach or peracetic acid or oxi), i can't understand why i haven't noticed thi film until the last batch...

 

[Kiknjville]

I had this same film on my last brew for the first time. It was also the first time I used foam control (mine is from five star.) That is where I assumed it came from.