I know nothing about this plant but it sounds very much like it. The name of this plant must speak for itself. You usually can't go wrong if you look at the origins of a plant and try to emulate the conditions of where the plant naturally grows

Hi ree,
You may want to go over to the cactus and succulent forum and try doing a search. If you dont find your answeres, just post your question there.

Alot of people in that forum grow this plant.

Good luck,
JoJo

Once they sprout they need to be kept lightly moistened, not wet. I agree it sounds like you may have over-watered. Allow the surface of the soil to dry a bit before watering again. The amount of water needed decreases as they get bigger and they should get almost no water over the winter. Use a well draining mix but not sure about limestone sand. Try something neutral like sharp or builders sand or forget the sand and just use the perlite.