Interesting. I have not grown Caralluma. Are they difficult to grow? I spent many years in CA and that is where I grew most of my succulents. I said I wasn't going to grow many here due to the space constraints ...
but. Well, you know how that goes. I did get rid of some but I think I just turned around and acquired a few more.
I like Rhipsalis, Epis, and the "rattail" cacti ... as well as Echeverias, Aloes, and Schlumbergera. Another fave is Euphorbia milii.
My Rhipsalis elliptica is blooming now since I brought it into the garage.