So we went to Petco about 4 months go and put this little 2 inch "black spotted grouper" in our tank. He lives happily with Snowball the snowflake eel and is frenemis with Pablo the Picasso trigger. Gulp (I have kids who name stuff!), seems to be turning colors with his mood. He goes from jet black with white spots to like beige or with patches of beige. He also looks like he has spines along his back. He is friendly and likes Snowball, Pablo has turned into the tank jerk. He is about 4 inches now. I'm really not sure if he is black spooted grouper. Any thoughts?