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Ok so I have 5 fiddler crabs in a 25 gal tank. The tank is divided into 2 parts by Plexyglass. I have plants over hanging into the water from the land part of the tank into the water. My Fiddlers only stay in the water ( they have been on the sand before but prefer staying underwater...). So now my sand section is not in use. Is their a creature that only lives in sand and does not need to live in water?