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A place where you can learn about Tree crabs, otherwise known as Hermit crabs, and learn how to care for them as pets!
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Hermit Crab Care
Re: rashes -
The black thing could be a gel sac, where the leg was injured and it is healing it before a molt. It could also be what they call Shell Rot Disease.
To treat that, need to get some Melafix and mix it according to the directions. Give the hermie a bath in regular water and then use a Q tip to put some of that on the bad spot and then also some antibiotic ointment. Repeat the Melafix and ointment treatment twice a day and that seems to help cure it.
Good luck.. Keep us posted