6" deep mix of play sand and coconut fiber (50/50)
2. Do you have gauges in the tank to measure temperature and humidity? If so, where are they located and what temperature and humidity do they usually read?
Yes - temp ~72, humidity ~80%
3. Is a heat source used in the tank? If so, what?
No - temp holding steady in mid 70s
4. What types of water are available (fresh or salt) and how is the water treated (what brands of dechlorinator or salt mix and what ratio is used to mix it)?
Fresh water (bottled distilled) and salt water made from drops & distilled water
5. What kinds of food do you feed and how often is it replaced?
Commercial dry mix and various treats from Hermit Crab Patch (fruit mix, fish, chicken), fed out of washed bottle caps
6. How long have you had the crab and what species is it, if known?
3 weeks, 2 purple pincers
7. Has your crab molted, and how long ago did it happen?
No
8. What type of housing are the crabs kept in, what size is it and what kind of lid is on the housing?
10 gal aquarium, mesh lid with plastic wrap covering
9. How many crabs are in the tank and about how large are they?
2 - medium sized
10. How many extra shells are usually kept in the tank, if any?
3 extra shells (no interest shown)
11. Have there been any fumes or chemicals near the crabitat recently?
No
12. How often do you clean the tank and how?
Wiped out glass with damp cloth, remove debris from substrate mix
13. Are sponges used in the water dish? If so, how are they cleaned?
No
14. Has anything new been added to your crabitat recently?
Cholla wood (which got moldy and took out), hemp climbing net (soaked in water and sun dried), dried moss
15. Is there any other information you would like to share that might be helpful (anything that is regularly part of your crab care, playtime, bathing, etc.)?
Taken out daily to play (gently), spray with water bottle every other day, only bathed 3 times over 3 weeks
16. Please describe the emergency situation in detail.
Several things, not sure what I'm doing wrong as a new owner. Thought I was following all the directions

1 crab (which used to be sprightly and playful) now doesn't want to come out of shell when picked up, doesn't move around the cage much, doesn't climb, occasionally peeks out but just sits in the same spot (not buried, just on surface). Tried to give it a bath yesterday but then when I put back in the cage, one of his legs fell off (walking leg, not claw). Not sure if I should just leave him alone, isolate him, do anything?? We're brand new crabby parents and I'd be so sad to lose one after only 3 weeks.
Other crab seems to be doing ok but neither crab seems to be eating anything! I've tried a variety of fruits and proteins but nothing seems to be enticing. I saw one crab look like he was eating something off the side of the tank wall. Neither seems to show any interest in food of any kind.