Can you put a new hermit crab with an old crab?

It is possible to introduce a new hermit crab to an existing crab, however it is important to do so carefully to ensure that the new crab is accepted and does not disturb the existing crab. When introducing a new hermit crab, it is important to:

* Quarantine the new crab for at least 1-2 weeks. This will help to prevent the spread of disease or parasites to the existing crab.

* Introduce the new crab slowly. Place the new crab in a separate container, such as a small tank or plastic box, with a lid with holes for air. Place this container inside the existing crab's tank.

* Observe the crabs closely for signs of aggression. If the existing crab shows any signs of aggression, such as pinching or chasing the new crab, remove the new crab and try again later.

* Provide enough hiding places for the new crab. This will help the new crab to feel secure and reduce the likelihood of conflict with the existing crab.

* Feed the crabs separately. This will help to prevent competition for food and reduce the likelihood of conflict.

* Monitor the crabs closely for several days or weeks. Make sure that the new crab is eating, drinking, and moving around normally. If you have any concerns about the new crab's health or well-being, consult with a veterinarian or a knowledgeable herpetologist.

With careful introduction and monitoring, it is possible to successfully introduce a new hermit crab to an existing crab.