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osmotic shock?? I did try to increase my salinity in my tank. It was at 1.023 and I was told to get it closer to 1.025 for my new corals. The corals are all new to my tank, but my hermit crabs have been in there for several months. Also, I had an emeral crab for over a month, and I found him...

I mean that my crabs are just sitting on the bottom of my tank upside down. They are still alive, but not really moving around at all. They look stunned, and I'm afraid they are going to die.

I am new to the hobby, so please forgive my ignorance here...Do maxi mini's kill or stun hermit crabs or emeral crabs?? I also just added a torch coral also. Could either of these be making my hermit crabs turn upside down??