for what reason would the soil turn green in sum parts?

YES, what you have growing on your soil is algae, you have nothing to worry about unless the algae begins to turn red, because then it is a poison type of algae
 
yeah its algae i have the same thing happening on my seedlings. i like it. it looks neat. i purposley grow moss and stuff on my yard, to me it looks better than flowers.
 
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