No substrate on the bottom makes for an easy find.
The armatus' tooth is already in his mouth full grown and bent backwards. I can't believe how fast it happened, I'll let you know when it's upright. I'd estimate the whole process to take less than 48 hours, from the loss to full recovery.
I have about 10. I swore to myself I would keep everyone... That didn't last too long. When they get bigger though I am considering collecting again and making some kind of cool tribal freekin thing for my neck. I would only wear it while in my fishroom chanting and dancing naked in a circle while worshiping my Armatus God though.