Brown substance growing on glass?

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Aquarium Advice FINatic
Joined
Jan 16, 2011
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Location
Fort Worth, Texas
I have a ten gallon aquarium with guppys, ghost shrimp, and a nerite snail. A while back a brown substance started to grow on my bubbler wand but the guppies would eat it and it went away sort of, it also grew on part of the filter that's inside the water. I woke up today and I noticed it was on the glass itself. It scrapes off easily with a brush but I was wondering if this is something to be worried about? :confused:
 
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