The fruit and oak was added in primary and in a grain bag. Particles would have had to make it through the bag and the siphon tube also so I don't know for sure that that's what it is. It was just the first idea I came up with to explain why there was mold on the surface of my beer. Did not know...
This thread has me less worried now. Saison that was in primary first with wlp565 then Brett B for a month. (Also got some oak and orange peel for a week). Transferred to a Carboy for secondary. This is 6 weeks in secondary. I was worried the floaters of orange pulp had molded in the air. Maybe...