The Halloween Hermit Crab is a popular saltwater aquarium invertebrate that is highly sought after for its unique appearance and scavenging abilities. These crabs are native to the Caribbean and can be found in shallow waters along rocky shorelines and coral reefs.
 
Halloween Hermit Crabs are typically small in size, growing to around 1 inch in length. They are named for their striking black and orange coloration, which resembles the colors of Halloween.
 
To care for Halloween Hermit Crabs in your aquarium, you'll need to provide a tank size of at least 10 gallons with plenty of hiding places, such as rocks or shells. These crabs are known to be quite active and require ample space to move around the tank. They are also sensitive to copper, so it's important to avoid any medications or additives that contain copper.
 
Halloween Hermit Crabs are generally peaceful and not aggressive towards other fish or invertebrates in the tank. However, they can become aggressive towards other hermit crabs if there is competition for food or shelter.
 
In the wild, Halloween Hermit Crabs are scavengers that feed on algae, detritus, and small invertebrates. In the aquarium, you can provide them with a varied diet that includes algae wafers, sinking pellets, and small pieces of shrimp or fish.
 
Maintaining water quality is important when keeping Halloween Hermit Crabs in your tank. They prefer a salinity range of 1.023-1.026 and a temperature range of 72-78°F. You'll also need to provide good water flow in the tank, as these crabs rely on water movement to help them find food and oxygen.