From what I've read they can split to reproduce, but I'm not sure that is what is happening here, he ended up coming all the way out and was curled up in the opposite site of the tank in the corner, as of this morning I can't find him, I figure he is one either dead, or two growing a new tube somewhere he won't be bothered by the blue hermits that liked to climb on his tube and then it would crimp it. I think after he went through the picking on by the blenny in the other tank, then the losing of the crown and regrowing it the hermit was the last straw. The old tube is freaky, you can see down inside it and parts of it are transparent from where he was picked on previously and where the hermits were picking too.
I hope he pops up sometime soon, miss seeing him they are soo cool and beautiful.
Let ya know if he comes back out and hopefully get a pic. Never a dull moment!