Very hard to tell, keep your water chemistry excellent and you never know. Right now I have had NO sucess in having them multiply. My last tank had a mushroom the size of a softball, and didn't split.
I also picked up a little tip from a friend, if you feed them, feed them heavy, and then stop feeding them in all, and the monter colony will split because it won't be able to survive witht eh lack of food. (works for the non-photosynthetic only)[actually works, he showed me]