Please choose the correct ending to complete the given sentence: Pets and Animals: [header] How to care for a crab [title] Obtain an aquarium tank. [step] Six crabs can live comfortably in a 3-5 gallon tank. Ensure the tank has a screen at the top to allow the passage of fresh air.

Ending1: If buying your tank secondhand, give it a good rinse and scrubbing with soap, and let it dry before placing your crabs in it. [title] Make the tank a crabitat. Ending2: Make sure the screen seals tightly around the tank, allowing some wiggle room. [substeps] Non-plastic scales should be inserted into the tank before putting the crab in. Ending3: [title] Relocate the crab during the fall, winter, and spring months. [step] Make sure the tank goes away during the coldest season. Ending4: Crabs are susceptible to shell shock if exposed to damp or hot air and won't tolerate saltwater temperatures. Only allow 10-18 hours in a tank between 240 and 450 degrees fahrenheit (35-38 degrees celsius).

Answer format: ending1/ending2/ending3/ending4