Funny thing with kids. They may get a pet, but you’re the one that’s taking care of it. A week or two back a friend of ours came back from the New Jersey shore with a hermit crab for Alyssa. It was in a wire cage and had a shell, a sponge, some of those hard pebbles that are normally present in aquariums, and a bit of food. After doing some reading, we found that hermit crabs are social, despite their name, and that they need humidity of about 70% and temps around 70-72.
So we now have a ten gallon glass tank (thanks Jason!), sand, moist soil, climbing things, food and treats, extra shells, water dish, and a special water treatment chemical that de-chlorinates water. We also bought an under tank heater, but so far haven’t needed to use it. There are also special light fixtures you can use, but the hermit crabs seem fine without it.
Oh, and three hermit crabs.
Again, Alyssa’s pets… yet Dan did the setup and I’ll be doing the maintenance, lol.
My name is Jenn, and I'm 27 years old. I'm happily married to my best friend and soulmate, Daniel. Together we have a seven year old daughter named 
Name: Alyssa
Name: Ryan
Wow! Who ever thought that hermit crabs could be such complex pets! :O