My parents had a 55 gallon tank set up and running for 2 weeks, they then added a black convict. Within an hour it turned from black to almost completely white. All of the chemicals test fine. This was a week ago and the fish is still active and eating, but it's white. I just arrived home from college and I had a 20 gallon with 3 small fire mouths. In my tank they were very colorful and healthy. I added 2 of them into the 55 and within an hour they lost all color. Like the convict, they appear active but they lost all color. The fire mouth in my tank stayed colorful. The test strips still read fine. Does anyone know what is going on?
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