I bought one here last November and he survived a trip to MN in cold weather with a warmer pack. His bag water when opened was at 68 degree but after slow acclimation he did fine and has been swimming around my 40 gal Reef Tank since. He is now about 3 1/2 inches and a peaceful tank mate in my tank of 7 peaceful fish, i.e. 2 clowns, 3 pajama cardinals and a pygmy angel. Sometimes he will briefly chase the angel but does no harm. I have soft corals in my tank as well as hermit crabs, an arrow crab and 2 other crabs. He does not bother any of these. He adds color to the tank and sometimes it looks like he is looking at me with his big eyes.