ronfam

There's a good site called gideononline.com. You have to register and you get a 15 day free trial. I used it to ID my mirco unknown this semester. Did you try looking at in under oil? That would increase the mag. That, or I'd restreak it onto a BHI agar (or some agar that has more nutrient than the regular nutrient agars). That would let your colony grow and hopefully increase the size of the cells. Head for MacConkey if you have it. That will help tell you if you have a member of the Enterbacteriacea or not. It sounds like you have a facultative anaerobe/aerobe, it can grow in the presence of O2 or not. But, since yours had some much growth on top, yours really likes the O2. Most of the unknowns are facultative aerobes. Strict aerobes or anaerobes would be too dang easy to ID.