Where to post and/or get advice about your molting hermit crab(s). Includes pre-molting, molting, and post-molting issues.
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There are many different reasons a crab won't molt. At the top of this forum there is a list of questions you can copy/paste to answer doing that will help determine if something is wrong. I will not be on for the next few days but someone else will help you figure out what if anything needs to be done.
The reason I ask is your other post reflects that they have regrown legs which as far as I know only happens in a molt. So, as far as you know they have not buried in the sub even for just a few days? Surface molt is possible but only if you had a day or two without looking at them. That is hard to miss.
well when they get in their hut together, they hardly ever come out but there was one time a little while ago that they didnt come out for a couple of weeks and they when i finally took them out later that was when i noticed the new growth
Sometimes they change shells when they molt. Sometimes before they go down sometimes after they come back up from the molt. They may have molted in those couple weeks you didn't see them. What they do is shed their exoskeleton and wait for the new one underneath to harden. Some do this quickly, some not, depending on size, breed and the individual nature of the crab.
Some crabs won't change shells until they are too big and falling out of the one they have. If they like the one they're in and it still fits then its not that big of a deal they didn't switch shells. However they may not like the other shells you put in try putting a few more different ones in.