so thought i would post an update of my glox leaf experiment. I now have a nice little baby plant happily growing along. problem is i can't remember if this is the one that i rooted in water or that i put in soil. because one is this nice little plant and the other is still a leaf in the dirt - not dead yet though.
Either way works fine, just like Rex Begonia or African Violet.
You can stick the leaf cutting in water or sand (has to be clean fine sand or vermiculite type of stuff to prevent rot) to get them to root.