That looks like the Ramshorn snail, they can come from anywhere fresh driftwood, live plants you bought, its hard to get rid of them, how I got rid of mine is continuously take them out when you see them, and they lay eggs on glass and driftwood, and the more you scrape off the more the population will go down. I find 1 or 2 every so often but used to have well over 50 in my 30 gallon. I got them by adding fresh driftwood from a river. Now moved all my stuff to a 60 gallon and still find one or 2 they are a pain because I have mystery snails and these look super ugly. And YES they will take over, get rid of them till its too late, and get some good snails like apple or mystery, I personally like mystery because you can control their reproduction they lay eggs out of water and they are large, so if you don't want no more just take em off and chuck em.