A question about microbes growing media
You can put any media in a GasPak or other anaerobic system depending the type of anaerobic growth you are looking for. Sometimes blood is simply added to media to meet nutritional requirements of an organism. I use Columbia Blood agar often as a general purpose anaerobic medium. In a collection of 100+ obligate anaerobes I am working with, around half grow well on columbia agar with 5% sheeps blood, and many of those will not grow on Columbia without this blood amendment. As an added bonus, I can easily spot certain common contaminants growing on my plates by their hemolysis paterns.