Jade plants need full sun in order to grow properly and need to be drained well. Allow the soil to dry out completely before each watering. Softening leaves indicate it’s time for more water. cast iron plants can handle low light, extreme temperatures and can survive for a good length without water. However, It’s still a good idea to keep the soil moist for healthy growth by watering every 2-3 weeks.
When the succulents grow leggy... just clip them and poke the cutting into a different place. Being planted in tightly bound moss keeps them from growing too fast or too big. jmsucculents.com. a great website if you're a succulent fan.