I’m so excited! I recently purchased this tephrocactus geometricus rooted segment. I’ve been wanting one for a while, but I do not have much cactus experience. I am concerned about the substrate she is planted in, the rocky bits seem to be top dressing, the majority is some kind of organic matter & maybe super fine sand. Should I repot her before spring into something more gritty; or will that cause more harm than good? I don’t want to disturb her roots too much if she is dormant. She is currently in the nursery pot which does have plenty of drainage & is 4” around.