Snail ID Please!!

[Pazil]

Well .... for the last while I have been searching the net trying to find an ID on these guys with no luck.... I can easily count 30 of these guys on my glass and they seem to stay on the glass rather than the substrate or rock from what I have noticed. They are multiplying at a quick pace... Here is a pic of the snail and of the new egg sacks from today... Anybody have any idea on what type of snails they are. Thanks in advance.