Hi Nflytrap and Dustin,
great news on the eggs. There may be more eggs in there so redry and wait 3-4 weeks and try again. This idea of putting a smaller container of peat into a larger hatching container is brilliant. I will steal it -- why didn't I think of it years ago?! You're research paid off well! Good job.
The fry can hatch out over 2-5 days so wait a bit. After day three start adding small amounts of hard water and you're on your way. Feed bbs twice a day. Keep the water clean. 20 fry will be fine in 2-4 gallons of water for 2 weeks easily. After that move them water and all to a bigger tank. Just pour the contents into the larger tank and start filling it up over time. You may want to add a tsp of salt per 2-3 gallons to help you. Dissolve it first and pour it in. Good luck.
I have P. velifera and petenensis as far as mollies. Mollies need room, many water changes -- big ones -- like 75% twice a week, good strong filters and tons of feedings. They do not need salt. Give them protein foods (worms, shrimp, etc) and veggies. Mollies are demanding because they require as clean of water and the room that discus need. Most people won't put that much trouble into livebearers. Latipinna is the hardest molly to keep healthy. Petenensis and shenops types are the easiest.