Hi hi! I have a small cactus (about 4cm tall) that isn't doing so well and I'm having difficultly figuring out what's wrong with it. My sisters gave it to me as a gift. It's been doing well for the past two years, up until this summer when it started turning yellow from the base (since the picture, the very bottom has started turning pinkish). I thought it might be rot because it is somewhat soft, so I took it out of the pot but it isn't as squishy/smelly as expected. My previous cactus died of rot/overwatering, so I've been really careful with this one, only watering it once every two weeks and making sure the pot has a drainage hole. I also considered corking, but it doesn't seem hard enough and the cactus has shriveled some. I've also wondered if it's just general stress (I'm a university student so I had to take it home for the summer and bring it back to school). So I'd like to know 1) what the problem might be and 2) if there's a way to save him. Any help would be much appreciated!!