So I've had this cactus for a couple of months now and still don't know what breed it is. I think it might be a moon cactus, but it's such an unusual shape and colour (at least from what Google shows me) that I can't be sure. Recently I've noticed that the top of it has started to turn green, and the little buds have also started to grow. There doesn't seem to be any evidence of rot or anything, is the top half of the cactus starting to grow on its own? I know lots of shops "graft" cacti that don't make their own chlorophyll, is this what happened with mine? Has it started to produce its own and should the top half be replanted?
Sorry if this seems like an obvious question c: