On one of my hermit crabs shell I noticed a red curling tube. It looks like there could be a little black head of some sort protruding from the tube. I have tried to get it with tweezers but never had any luck. The red tube is hard but thin and brittle, like a very thin shell. I broke it with a pair of tweezers a few weeks ago but now it has grown back fully like nothing ever happened!
Any clue on what this is??
![81A90921-450E-4FCC-8285-E8A742D4E5A9.jpeg 81A90921-450E-4FCC-8285-E8A742D4E5A9.jpeg](https://test.reef2reef.com/data/attachments/2957/2957958-d05e9ca1e2a7fd417e39a207585f7fb8.jpg)
Any clue on what this is??
![8EF2771C-6AB3-487D-8855-37E9F3ADB2DF.jpeg 8EF2771C-6AB3-487D-8855-37E9F3ADB2DF.jpeg](https://test.reef2reef.com/data/attachments/2957/2957957-e3b29715adfbc56f13a4d9309609114e.jpg)
![81A90921-450E-4FCC-8285-E8A742D4E5A9.jpeg 81A90921-450E-4FCC-8285-E8A742D4E5A9.jpeg](https://test.reef2reef.com/data/attachments/2957/2957958-d05e9ca1e2a7fd417e39a207585f7fb8.jpg)