I just finished acclimating and placing my new bimac in the aquarium, and it was the first time I could get a good look at him. Unfortunately, he seems to have a wound on his head. The picture isn't very good; I didn't want to use the flash more than once. Should I be concerned? Is it serious? Anything I can do? Would it of happened during shipping since there wasn't anything in the bag with him? Or before he was shipped?