It looks sinistral (shell grows counter clockwise when viewed facing the apex) like a Physid (aka bladder snail family), can you take a picture with the opening facing the camera? It won't help me ID it much since I only know some of the wild snails in my area not the melting pot associated with the planted tank trade but it's an important character to start with if anyone else might know. A photo showing the tentacles is probably also a good idea.