[quote="chuck78, post: 521399"]That looks like a male emerald. Males can get very mean. All the emeralds in my tank are female & excellent cleaners. I would get another emerald if I was you, just make sure its a female. Females have & keep tiny claws FYI.[/quote]\r\n\r\nYou can identify crabs by the aprons on their bottom. The females have a much wider ones.\r\n\r\n[IMG]http://www.bluecrab.info/images/identification/abdomen_jimmy2.jpg[/IMG]\r\n\r\n[IMG]http://www.bluecrab.info/images/identification/abdomen_sook2.jpg[/IMG]\r\n\r\n\r\n\r\nAnd are porcelain crabs so aggressive?