I have 4 mystery snails and 15 little snails and I am awaiting having eggs. They've been on top of each other and two were really doing something..intense a few days ago. One of the biggest of the 4 big mystery snails is up at the top out of the water in the corner right now doing who knows what and I don't want to get my hopes up but I am really wanting babies. I don't know a clue about taking care of baby snails and mystery snail eggs though.

How do I take care of them?
When will I get them?

How many?
How long does it take mystery snails to lay eggs?