I came home tonight and my dragon goby is acting strange.

He's swimming all over the tank and sticking his head all the way out of the water. Mind you, I've only had him less than a week, and I usually see him during the day when he just lays on the bottom. Tonight I came home to a dark house, so maybe this is how they normally are. I've heard they're more active at night. I'm not sure, it just seems very strange to me that a fish would stick his head all the way out of the water like that. He's not gulping air though.