So I wanted to try a fruit beer, and recently got to doing one with Passionfruit. It's in a secondary at the moment with the fruit. It is only a small 5 L test batch I went away over the weekend and came back to the brew with a film of white material on top. There are no discernible off smells, and I risked a small taste and there is no indication of off flavors. Everything smells and tastes fine, but there's this white material. It almost looks like the film that milk gets if you put in in the microwave to heat it up, or leave it out too long. The white material does not seem to be anywhere except the very surface of the brew. Has this beer been contaminated? Or has some kind of film from the fruits just formed on top? I've never brewed a fruit beer before so I'm not too sure. (That slightly yellow stuff you see is the passionfruit). Cheers!