Purple pincherDolfan said:What kind of crabs? Try googling the species of crab with the word "care" at the end. Also try proofreading your posts and subject line. A little more info will help others be able to help you.
20 gal and 70 humidityQuiche said:What's their current setup? How long have you had them or are you just curious about crabs? Are there any specific points you want to know about or doyou just need a quick overview of everything
Humidity needs to be set at 75-80%, and they pretty much each most vegetables and fruits. Google 'hermit crab diet' and you'll get a ton of good websites!