[header] How to care for a hermit crab (purple pincher ) [title] Obtain a tank. [step] 10 gallons (37.9 l) is good for a few small crabs but for jumbo crabs you will need a 20 gallon (75.7 l) tank. 10 gallon (37.9 l) tanks are about $13 and 20 gallon tanks are about $31. 
Avoid buying starter kits at pet stores, because they don't hold humidity in. [title] Get the accessories, you need something to climb on such as; choya wood, driftwood, or mesh at the back of the cage.