It is actually inside the tank, directly over where he is sitting. The pic just makes it look different. It was over the screen for a while, I just placed it inside about a week ago. Can moving/ changing decor around a lot cause him to have relocation stress by chance? I have changed his tank setup 3-4 times since ive gotten him 5 weeks ago. however I did wait over a week to change it the first time so he can ssettle in new tank.