Nah it was just me snatching them up while you sleep.

I've had one or 2 heads suddenly disappear before. I wanted to add that you should leave the skeletons right where they are for about 2 months. I lost a hammer once to a tear in the flesh. I did not move the skeleton. 2 months later I had about 24 tiny heads growing out from it. 3 months later I fragged them and moved them all over my tank, gave some away and put 2 heads in my girlfriends nano. Now my original is growing even more heads. All in all they are each about the size of a quarter after 6 months.