Sooooooooo my family is very new to the hermit crab world and it AMAZES me how mis-informed the people that sell them are! We got ours at a guy that sets up a booth at a local indoor market place. Of course they are all painted shells with things like Dora and Spongebob to draw people in which is EXACTLY what got us to buy them (Until I read and watched the horrifing videos!) Anyway this guy sells you 3 crabs in a 5 gallon plastic carry tank thingy with a coco hut food, a sea shell for food dish and a sponge. The substrate is gravel. And your off...no more info other than dont feed it citrus or dairy, I left there feeling like we had just bought a Gremlin and terrible things would happen if we did not listen to this man lol 3 days later one of the crabs started losing legs I mean like 1 every hour it was HORRIFYING! I looked it up, probably stress and to ISO him, he was dead the next morning poor thing. The GOOD thing that came out of it was that I started READING everything and anything I could get my hands on about owning this wonderfuly entertaining pet! MAN was that guy all wrong!!!! I want to go there and steal every crab he has (Which is about 400 in a chicken wire cage with no substrate at aALL.) ANYWAY...they are now in a 20 gallon tank with playground sand as substrate, graded so there is room for them to bury themselves, they have fresh and salt water bowls and we feed them the food the guy gave us AND whatever we had for dinner that night. They are so entertaining to watch! We loved the 3 we had so much that we went and got more! We now have 9 and we are looking to get a bigger tank for more toys and stuff. My question is this, we got the new 6 on Sunday from the same guy I have a UTH on the side of my tank, I have the day glow heatlamp in the tank hood and the water bowls in there for humidity, I have temp/humidity guages and they are both always about 70-80. The new ones are buring themselves.... I thought they were molting so I moved one of them to an ISO tank and he did bury himself but came up that night... so I put him back in the tank with the others and he ate and stayed above ground for a while but the next morning he was buried again, most of the new crabs are doing this, but they always come back to surface. what should I do??