Capnophile.

It is an obligate microaerophile. Meaning it lives best in small amounts of oxygen.

I would think an aerobic organism would do the worst in an oxygen poor media, which would be one of the results of having an older media sitting around.

A faculatative anerobe does NOT require oxygen for growth but may use if available so it can grow in aerobic and anaerobic conditions. Too much oxygen is NOT toxic.

A micro-aerofile CAN'T grow without oxygen but too much oxygen is toxic so it must have a low concentration in order to grow.

Microaerophiles are microorganisms which are unable to grow when oxygen concentrations reach those found in air (20%) but nevertheless whose growth requires the presence of some oxygen (e.g., 2 to 10%). "Microaerophiles appear to grow best in the presence of a small amount of free oxygen. They grow below the surface of the medium in a culture tube at the level where oxygen availability matches their needs