Pacific Seas Aquarium (New in 2018)

Japanese Spider Crabs on the left and a Schooling Fish exhibit on the right with Pacific Herring.

Do the crabs have enough room to move around? Or are they sedentary creatures?

@Ebirah766 I find that whenever I see Japanese Spider Crabs in aquariums that there is rarely a significant amount of space for the animals. I have no idea if they are sedentary creatures, but most tanks that I've seen them in have been only adequately-sized for the species.