Mine is about 7" or so now and he is still like that. If you approach to quick he will rearrange the tank and hit the glass so hard you think its going to break. He wont eat if Im looking at him, Getting better used to not eat if I was in the room. Their eyesight is incredible. I rarely turn his light on at all anymore, he hates it and just hides in the corner with it on, He get a few hours of natural light Im sure thats plenty. He interacts with the dog and cat, but freaks if people come near.