I've also heard that CB clowns may take years to host anything. And, they can host anything from a large toadstool to a duncan or even a torch/hammer.
I have one that "host" my algae magnet. I don't think it is true hosting, but he sleeps with it at night.
I'm hoping with the new one that will come out of QT in a couple weeks, maybe they will find something to actually host with...but being CB its a crap shoot.