EVERYTHING i need to know about hermit crabs?

I had 4 hermit crabs once and they eat food that you can get from the pet store and also they eat fruits like apples, pears, and things like that. When i had my crabs i didnt use a humidifier i just sprayed water on them with a spritz bottle they gave me. I dont think there are any specific breeds. I would give them about a 3 on how expensive they are because they dont need alot of things. I would give carings a 2 because they are very easy to care for just food and water is needed and of course love. Yes they do need sponges because thats their nature and they might drown in the water. Hermit crabs dont eat each other. get a shell just a little bigger than the other and get about 3 so they have some to choose from. Two crabs will work because they have company but you can get more if you feel like it. Its only dangerous if they eat it or get their legs in them but you should just buy them with the oaint on them. They molt about evry 6 months or so and not sure if they can die from "bad molt". Wait about a day or 2 until you put them back. About 3 days or more is how long it takes for their exoskeleton to harden. HOPE THIS HELPS!! :)