haha im setting up my old seed shelf again for specialyl for lithops...use it for other but they are the reason. teh loph's are slow! im sure you have read all about them
unless you graft em dont expect much fast....lol. mine are still about 3mm wide @ 2months old. but they are ideal for your tank in the fact that they are spineless and dont liek full sun. im assuming you got a humidity somthing over them, so light wont bug them. but if they trun yellow/red/brown then they probably got burnt (i kille da couple that way
)
teh wall mart here has a few what look like astrophytum myriostigma in those little 1" pots. they are about 2" and only 1.69 or somthing....if i didnt need my cafiene fix i woulda gotten a couple.