Moon Cactus Becoming Dull
I've been doing a bit of research on this forum and it seems that most people aren't fans of these moon cacti, but I purchased before I knew it was grafted and would still like to keep it alive! Anyway, I've had it for over a year now but in the last few months it has become very dull and even has been becoming green, mostly on the top. Common sense is pointing me in the direction of the lack of sun in these grey winter days, but I just want to confirm!
I've attached a picture from when I first got it for comparison.