My lung took close to a month before I felt like he was totally comfortable in his habitat. He now eats regularly and comes to anyone who walks to the tank. He is very social. I have him with a 10" plocostomus (s/p) they do battle though occasionally. They certainly don't like each other. But neither has been wounded yet. They do make a scene when they battle and it causes both fish to spook and swim at high speed! Give him some time. He should adjust