I have my first lager under way. I made a 1 gallon starter for it about a week ago and the only thing I had that would work is a 5 gallon carboy. I put it in there sanitized everything and added airlock. I am steeping the grains right now and brought the starter from 50 F room and am warming to room temp. I think there may be mold I noticed small spots on the side of the carboy. They are white. My question is can you use too large of container to make a starter?