Sorry that he;s bity and sorry that people aren't really chiming in. Lots of people have problems with bitey sqs. Make sure he's not protecting his food. You might handle him after his food is gone or he's at least had a long time to eat it. Protecting caches is also a bit cause of aggression, as are weird smells like hand cream, deodorant, soap, etc. You might have to experiment to see what might set him off.