I have a couple Lithops I just purchased 4-6wks ago, they were shipped bare root & are about 1 cm. I dipped the root in rooting hormone before I planted them but a few of them are getting kinda soft (& one died) but I have them in mostly perlite & lava rock with just a little soil & sand mixed in. I've only given them maybe a 1-1.5 tablespoons of water each total over the past month, (the pot is wide enough I can water each individually) the 2 bigger 1-1.5in ones seem to be doing fine but the littler ones, I just don't know what I'm doing wrong. I also have them under grow lights. Any help will be greatly appreciated! Thanks