3 gallon batch -- problems in secondary?

[Teacher]

I'm going to brew a 3.5 gallon batch of strong old ale. I'll use my regular 6-gallon bucket for primary, which I figure shouldn't be a problem. However, if I use a 5 gallon carboy for secondary, will there be too much oxygen at the top? Should I just leave it in primary for a month?

 

[RICLARK]

I think you will be fine. I have made small batches before and didn't have any issues.