After my experiences with both WC and ORA mandarins, I would advise you not to get a mandarin unless you're prepared to go to a lot of trouble making sure that he feeds and gets enough to eat. It will be work getting him to eat prepared foods (and many don't). And if he never gets used to eating prepared foods, I don't think the live rock alone in a 65 is going to produce enough pods to keep him well-fed and healthy. They're adorable little fish, but kind of a pain in the @ss. Not a good beginner fish, IMO.