HCA: Hermit Crab Association

Hi, I've got a question. What I'm wondering is how deep do the dishes need to be? I was using a shallow dish from Zoo Med but then switched to a 3-4 inch deep container. However, it is a pain to clean out, so I was wondering if it was really required. Thanks.

Alright, there's been some fishy stuff happening with my smallest crab. Was getting ready to go to bed today when I noticed my smallest, in the corner, with a new shell. Normally, I would be like 'oh cool,' but this shell was smaller. Like, really small shell. I accidentally got a tiny one because I...