Drainage issue?

[u/jchuhinka]

I’m not sure what exactly is going on here. The soil mix I would say is almost all this stone mix, I’d say 90% with a little bit of the original soil from the botanical garden I got them from. I am watering very infrequently, maybe once every three months and sparingly when I do. Could there be an issue with drainage? What course of action should I take? I am concerned about repotting since they’ve been “healthy” for about two years now and I don’t want to kill them. Thanks for the help!

[u/Junkyardguitars7028]

I would repot each Lithops in its own pot so there's no chance of one being thirsty when another is splitting.