HCA: Hermit Crab Association

I'm sure it's hard to know for sure but any chance he would have died because it wasn't warm enough even so quick when I've had the other like 6 days and he seems fine? I found a heater and temp/humidity thing Zoo Med brand to order online but that will take a few days to get here. Is the other one ...

Here is the picture.

I am new to hermit crabs. Got my first one last week, then realized he should have (I've been watching videos on how to care for them and reading a lot on them) a friend so I bought another one last night at a different place. Had him about 24 hours he was really active last night and even today, cl...