Unidentified Crawling Snail

Hello to Everyone
This is my first posting to this newsletter. I'm new to the aquarium world and 
have little experience with Aquatic plants. I have just started a 38 gal tank 
and have been adding both fish and plants over the last few weeks. I noticed a 
small brown snail crawling around. He looks harmless enough and I haven't 
noticed any holes in the leaves of my plants. I am wondering though could this 
be the start of a problem or is this little guy really a beneficial creature I 
should leave alone?

Thanks for your advice.