looks fine. They are moist looking for the first few hours and then they will harden as long as no water gets to them. You can remove them the next day. You can hatch them in the main tank or a homemade incubator. Or throw them away if you do not want lots of babies. Or cut the sack in half or a piece of it off and just hatch a few. Here is a link to a website forum all about snails.