A lot of aquarium crabs demand a paludarium set up, that's a tank that comes with equally water and dry land. Even so, usually there are some entirely aquatic selections as well just like the pom-pom crab along with the very small Thai micro crabs. Take specific care with water https://www.tumblr.com/aquariumonlinestore/742686801175658496/4-things-new-aquarists-keeping-flowerhorn-fish