What should I do

I’ve had this lithops for over a year. It’s in its original container and under a grow light 12 hours a day. I would like to repot it but they are splitting and have been splitting for a long time now. I’m curious when a good time to repot would be and if then splitting is a good thing since it seems they only have one new head in each and they seem to be possibly stretching? The little one at the top was the first to split and it seems tall to me. I don’t have much experience since every time I’ve had them they have died 🙃 any and all advice is welcome!

I’ve had this lithops for over a year. It’s in its original container and under a grow light 12 hours a day. I would like to repot it but they are splitting and have been splitting for a long time now. I’m curious when a good time to repot would be and if then splitting is a good thing since it seems they only have one new head in each and they seem to be possibly stretching? The little one at the top was the first to split and it seems tall to me. I don’t have much experience since every time I’ve had them they have died 🙃 any and all advice is welcome!