I just got a male pastel breeder he's about 600grams and he is p-i-s-s-y! I was told that he was nasty because he had just bred....but its been a couple weeks now with no change. He tries to strike at me through the glass and when I do get him out he hisses and will continually try to strike any part of me that he can reach. I have read a few threads on this topic.....the consensus seems to be to handle often and don't be afraid of getting bitten. So....we shall see...good luck to you, I'm totally in the same boat.