I've noticed that whenever I turn my pumps off for a water change, my clownfish goes to the bottom of the tank and just lays there completely still. I used to think maybe he just gets scared of the pipe but today I tried feeding with the pumps off and he did the exact same thing. Even with food in the tank. And as soon as I turned the pumps on. He went to eating and chasing the food. I've had him for over 2 weeks now and other than this, He looks fat and healthy. Any ideas ?