Elegance, weird question

[Firepony]

I've had this Beautiful Elegance for over a year and he has done Great. Stretches to a good 5, 6 inches. But 4 weeks ago, in the stretch of a week, he detached from his Hard "trunk" and floating aimlessly around my 120 gallon tank, "resting" here or there. I finally put him in a little clear coral "safety holder". Will he reattach to something? Or just live unattached? I tried putting him back in his "home" but he just floated away.
????????
I also posted a pic of my tank, everyone in there looks happy and healthy. (It's looked this good for over a year now :)

 

[Firepony]

Oh and he is only like an inch long now