So I have had my brew in the secondary for a month now and I haven't looked at it for about two weeks. It was my first secondary attempt and i put a 5 gallon batch in a 6.5 gallon carboy. I hear there us probably a chance it will be oxidized. Is that true? I just looked at it and it looks like there is mold on the top. Is that normal?It would make sense being wet and room temp but I'm just not sure if it is a bad thing.