HCA: Hermit Crab Association

We've had my adoptees 3 weeks tomorrow. 1 is burried, the other seems relatively healthy, eats a lot, and has changed shells a couple of times.
The third has been most concerning. It has been laying very low, doesn't move much, and spends most of it's time hiding partially buried in the sub. When it does venture out, it heads back to it's same spot.
I checked on them this morning, and the quiet one is either dead, or getting ready to pull a surface molt. I will be anxiously checking the next day or so to confirm which.

My question is this:
How long do I have to keep the "healthy" one in iso (10 gal, ideal conditions) from our main colony (20g Long, also ideal conditions)? I'd like to move him over to the main tank, especially if the quiet one dies. Either way, really. But it's only been 3 weeks, and he definitely hasn't molted.

Thanks for reading my wordy post.

I don't isolate adoptions prior to adding them in the main tank, but if they are healthy and seem to be doing fine, I would say it's ok to add them.


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I've never personally ISO'd an adoptee. Just made sure they didn't have mites and put them in the main tank.

I keep them separate for around a week to give them time to eat and change shells, especially if they're coming from bad conditions. If they bury to molt, wonderful. If not, they get moved to the main tank so long as they seem to be doing alright.

Thank you, all!
Well, it wasn't a surface molt. One adoptee down. I moved the healthy one to the main tank, and will wait for the other to emerge from the sub.
Thank you!