His yellow color will convert to orange once he's fed a decent quality diet. His genetics will prove him to be a "creamsicle" morph, not yellow. Had this happen to me once, turned out the fish was being fed a low quality generic farm feed.
To the op this is what i meant.
Regular Flourecent lights
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Colormax bulb (brings out red And orange)
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Its really cool the difference
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Dang, that sucks. what else did you have in the tank?