Hi, I've had this moon cactus, who I call Sunshine, for at least three years. I read sometime ago that they tend to die after two or three years. I've been watching for short spots, one sign that they're dying. She doesn't have any. What is noticed is the top of the moon seems to be creating a separation and the color of the lower portion is fading. I water and fertilize following Planta's schedule unless she's not dry enough. I also read that it's good to remove the babies so it can stay focused on the main moon. To clarify when I say "I read" that means I've checked two of more sites I trust. Should I be worried? Is this a sign it's dying? The first four picture were taken today after giving her fresh soil. The others are over the course of three years.