Strange worms?

[prettylatte]

I got a 10 gallon, cycled tank a week ago. It's had one tiny little fish in it and this morning it had like 10 of these thick, white worms. I've seen the common thin, clear worms that come out when there is too much waste, but these worms are different. They stick to the glass and can move very quickly.
So can someone please tell me what these worms are and if they will hurt my fish? Thankyou so much! I'm really worried!

 

[shellyx]

To me it looks like planaria i have these in my shrimp tank, they move along the glass. They're harmless to your fish the fish might even eat them.

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