I never really consider Crassula for bonsai but I do have a potted Crassula as a house plant, that I propogated from a leaf cutting. Your tree needs more light, put it in a very bright spot or ouside for summer (I live in Britain in a zone 8 climate and mine will go out in May (they cant hack...
I've been delighted by the speed that this Cotoneaster horizontalis has developed. It is starting to look as I intended (though, of course, much more ramification is needed). Hope you like it folks, and coments and suggestions greatfully recieved! :)