Microbiological Fuel Cells - Identifying a Microbe

Hey guys! I need help in identifying a colony that has developed on my home made electrode. I have been experimenting with simple microbiological fuel cells and its been pretty interesting! I've torn apart my previous experiment and found something that wasn't there before. I've tried to search the internet for clues and so far I have convinced myself that it is most likely a bacteria if anything else. Unfortunately as this is a little home experiment i don't have the means of obtaining a microscopic image and this is all I can give to work with. Look forward to your replies!

PS: The black matter is simply activated carbon powder attached to a steel mesh. The slightly shiny white stuff is what I suspect to be the foreign invader