Besides the food issue (regarding maintaining yellow coloration wo oranging up) you are aware of, I have had no problem with any issues of growth or health with my yellows. My measurements were done crudely by holding up a ruler as opposed to netting them, but I feel my numbers are pretty close. If you desire yellows, I’d encourage you to go ahead with fish from a quality breeder/seller......you’ll love them. If you mix colors, just be sure the food you use has no color enhancers like shrimp, carotene, etc. Do know that these pics were taken in July.
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This Golden Sunrise from Kenny is 61/2”.
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This Golden Diamond from Kenny is 6”.
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This Albino Golden Millenium from Kenny was 31/2-4” when got him and now he is at or near 5”.