Our Halloween crabs are 2-3". Males are brighter than females as males tend to be more red, and females orange. They require approximately 80 degrees and 70% humidity. Substrate should be 6-8" of moist sand with a top layer of moist Eco earth. As these crabs are nocturnal, they do not require artificial lighting. A heat lamp can be used as a heat source and daily misting is necessary to keep the humidity stable. They require enough water to submerge themselves. Minimum enclosure is 10-15 gallons.