My clownfish has been sitting at the bottom of the tank like this for a couple days now. In the morning he swims up and eats but during the rest of the day he just stays low. I’ve had him for a year now and haven’t introduced any new fish ever since. Parameters are steady, ammonia, nitrite, nitrate, and ph. Just did a water change but everything seems to be the same maybe these pictures can help? Any thoughts, not sure if he’s dying.