Little Black Bug in Monitor Enclosure??!?

I had some bags of soil from outside that I guess had outsides bugs in it still when I added a couple extra inches of soil in my Savannah Monitor's enclosure. They are probably 5 or 6 times smaller than a fruit fly but with no wings and are either dark brown or black and relatively fast running for their size. They like to hang out on the wall of the terrarium (made of wood if that helps(These are not wood mites)) and whenever I open the cage i kill 20-30 of em. Any idea what these things are? I'll try to put up a pic in the morning.
 
I forgot there name but they feed off Fruits and veggies make sure theres none around. Once they get out of the cage they spread soo quickly! we had them in our carpet
 
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