Are you sure these are Red Texas and not Herichthys carpintis. Faders usually display signs of it very early. I've never seen a fader be normal then all of a sudden fade. It's usually they are showing signs of fading at a young age and then completely fade.
Not true I have rt that faded between 6 to 10 inches and I have had jade dragons and red dragons that were beast and then faded out of no where. The truth is you can never be sure.
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