The leg could be regrowing- perhaps it was not there before? The smaller pincher is correct
![](http://emoji.tapatalk-cdn.com/emoji4.png)
I provide several types of calcium sources at all times for my crabs. Coral, cuttlebone, eggshell, oystershell. No bowl is necessary- just throw a whole eggshell in there, a piece of coral- stick a cuttlebone upright in the sub, etc
Edit: I don't spray substrate- instead of mixing substrate- let the crabs do it for you- add 1" of moistened ecoearth to your playsand every 24 hours. They will mix it together. That will boost humidity
Sent from my iPhone using Tapatalk