Okay....I feel like such a loser because I keep asking so many questions. I have one crab down/buried who surprised me and is I assume molting. She's been buried for almost 2 weeks. She is small...a little bit smaller than a quarter. How long will she stay down? Well yesterday and today I noticed that her two crab friends have gotten a bit lethargic, and are digging some holes in the sand....play sand to sand castle consistency. When they were active, I called them the pooping machines because literally, I'd have to spot clean large amounts of poop daily (sorry if this is Too Much Info). Today and yesterday, definitly less poop. I've read from some to let them be and others isolate. My isolation tank would be a 5 gallon plastic tank which I understand is hard to regulate temp/humidity. The two which I believe are showing "pre-molt" symptoms are now hanging out in a small hole in the corner of my 10 gallon main tank together...cute but a bit worried. I am tempted to just let them be since there is already one down under. I have lost two crabs with my isolation and the temp/humidity is perfect in the 10 gallon main tank. Thoughts anyone? Thanks...you all rock with the valuable info!