I have no clue ha! I've never really given snail eggs that much attention. I figure for every cluster I see on the glass there has to be at least 5 more on driftwood, plants, filter intake, ect. So I'll just clean the glass like I normally do when I do water changes, and don't worry about going around em. Can't think of anything you really need to know, they will just do there thing. If you figure out how long it takes to hatch let me know.