I've lost several fish recently and suddenly. My bristletooth tang was healthy and eating well and fine last night. Woke up this morning and he is dead. Below is a picture of my clownfish which now has very faded color. He and the other clown have been in the tank 3 months and recently the other clown has bullied him somewhat but the tank is 65g with plenty of rock separation for them to have their own areas but they do sleep together at night. Kind of how my marriage works to. Why is his color fading? He eats and swims fine. I've tested the water and all parameters seem fine. Did 20% water change Friday with RoDi salt mix. I get my fish through a service that does 3 week qt process. Need help please...