Crassula's prefer sparse watering, with the soil drying out completely before being watered again.
They enjoy plenty of direct sunlight in order to stay 100% happy.
When grown as indoor plants, Crassula plants prefer a porous, somewhat dry potting mix. A cactus/ succulent mix with some extra peat moss mixed in is ideal. Make sure the pot has good drainage, as these plants don't like to have soggy roots.