HCA: Hermit Crab Association

That looks like an injury to me, possibly from being pulled from it's shell by another crab when you found it naked - they will attack their own if they find one that is in the process of molting. If it's not getting bigger, then it's normal darkening of the flesh in response to being exposed to ai...

That does look like shell rot, or some kind of bacterial issue. It's not unusual for a contagious shell rot to begin underneath the current exo and not show up until the animal has shed the exo, so you wouldn't have known when inspecting him when you first got him. Well, that is good and bad news I...

1. What kind of substrate is used in your tank and how deep is it? Coco fibre, 4" deep 2. Do you have gauges in the tank to measure temperature and humidity? If so, where are they located and what temperature and humidity do they usually read? Yes, temp 72-75. humidity 70-80 3. Is a heat source used...