So I found these weird worm looking things on my aquarium glass. 
I asked some people in Montreal, and they said that it's baby snails. Unfortunately these are the same people who think that a silver arrowana can live in a 120G aquarium, so not a reliable source. Are these in fact baby snails, or something bad? If they are a bad thing, is scraping the glass enough, or do I need to treat the water?
Thanks!

I asked some people in Montreal, and they said that it's baby snails. Unfortunately these are the same people who think that a silver arrowana can live in a 120G aquarium, so not a reliable source. Are these in fact baby snails, or something bad? If they are a bad thing, is scraping the glass enough, or do I need to treat the water?
Thanks!