I've recently bought a royal gamma from the fish store. It was doing great initially. After I introduced him into my tank I noticed on his right side around his head there is a brownish area. I didn't think too much of it because he was eating and swimming around and then hiding back into the rock crevices whenever I came around. This has not been 5 days since introduced him and now he is not as active. He just lodges himself in a space and sits there. I managed to catch to him have a closer look and noticed that the lens on his right eye might be punctured too. His breathing looks normal and steady. I dunno what to do. He is my measuring cup right now laying on his left side. Any ideas? Thanks.