The snail eggs like to be in humid environment, but not wet. I used a little baby fish, Fry food, Hikari makes one which is great, First bites to make sure they had a little extra to eat once in awhile. A little goes a very long way. Like use a toothpick to scoop it up to put in the tank, lol.
And don't clean the glass if you can help it because they will eat biofilm and stuff on there.
It is really fun, at first you see a little speck moving on the glass and then a few, and then there can be hundreds!!!
Mine were in tank with all kinds of mostly peaceful tropical fish and I didn't seem to miss any, there were a lot!
Sometimes the eggs are duds. So don't be too disappointed if nothing happens, chances are it will eventually.