Wow interesting I notice they are a few yellows being sold on Facebook I wonder is the food the reason they are yellow...because i remember yellow being the rarest color to get... i have kept a good bit of barred and colored Cits Midas and my barred always seemed a lot more aggressive and they ate small fish when my colored ones were mild mannered and never ate fishAnd here's a yellow midas that I used to own.
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Which turned out was being fed a low cost commercial farm feed. Once his diet was changed to a more premium food, his color changed to this;
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The fish I posted pictures of started off all yellow, then started morphing. You can see in the first pictures some yellow. Now it is definitely more orange, like yours.The fish shown above is orange and white, not yellow. Commonly referred to as a creamsicle color morph.
True yellow A. citrinellus morphs are fairly rare, Rapps imported a multi colored wild midas years ago, that was partially yellow, but I believe that it died not long after being sold. Behaviour will be the same as any other cit, color doesn't have a behavioural impact in domestic midas.
James, your fish was simply a faded out creamsicle, that gained color as it matured, which is quite common with juveniles of that color morph.
A yellow adult A. citrinellus is a whole nuther thing …..