Each clutch can hold between 50-200 snails. So you could have 1000+ snails. If you do not have plans for that many snails, I would remove the clutch/ clutches and freeze them prior to throwing them in the trash. That way there is no chance they can make it into the wild and cause problems. Depending on how warm and humid your tank is, it can take as little as 9 days and as many as 21. After 21 days, if they haven't hatched, I would freeze and discard.