I noticed tonight that my cucumber was looking really shrunken and odd-colored. When I went closer, I saw that one of the emerald crabs had it in basically a bear hug and didn't want to let go when I pushed it a bit with my sand-stirring stick.
I scooped up the cucumber and watched it for a while. It stiffened up when I first did it, but went kind of limp a bit later. It was moving its feet things but had all its tentacles(?) pulled in. It tried to move a bit but looked really jerky and slow.
I got worried so I've moved him into a container that is floating in the tank in case it goes bad tonight
I hope he pulls through, but don't want to risk anything, especially since I'm holding some corals for a friend.
I'm pretty bummed. He came with the tank, and was the first inhabitant that got a name.
Is there anything I can do?