Ok I have one hermit crab that is always crawling out of the water. It is the same hermit. I put him back in and he crawls up the glass out of the water. What is wrong with him? He hates being in the tank... I will post a pick in a moment.
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he's actual home (Ocean) sick. Or maybe he's scared of the Kraken in your tank =).
Many hermit crabs in the wild are tidal creatures. They roo around the tide pools and frequently are exposed to air when the tide goes out. I see them all the time when I go exploring the tide pools on the oregon coast. I woiuldn't worry about it. I'm constantly "rescuing" snails that crawl out of my rimless cube. THey have a harder time in the reef as that has a rim.

