euphorbia lactea "Cristata"
This very unqiue plant is actually 2 plants in one - the green base & the coral top are grafted together from two varieties of Euphorbia. Watering differs a bit from usual Succulent care, as grafted plants often require a bit more drinking time. Never let the soil dry out, only about 2-4 inches of the soil should ever be left dry.
This plant needs warmth - ideally left in a sunny window that gets at least 5 hours of sun a day. Make sure to rotate your Coral Cactus so it doesn't grow lopsided.