I've got rots, but.....
Like everyone said there is way more to it then that. And if they are to hatch tonight and you don't have rots already established then I'm afraid it's to late for this bunch.
Good news though, if they are laying eggs and they don't get disturbed they should lay eggs again unless than a week after these hatch.(usually).
What I would suggest is you read as much as you can on the subject. A good place for info is marinebreeder.org
After you have read as much as you can if you have questions just ask. I can give you some rots to get you going.