All three of mine look quite different as it is, in the same tank with the same food and same lighting. One is much darker, more orange than yellow, one is more maroon than red, and one is the classic red with yellow. Lots of variability in this species.
I was simply stating from my view as a biologist on the color bit. Red creatures (high in carotene) bring out red in the animals that feed on them. Like flamingos (start out white, turn red/pink from krill). And salmon (farm raised are dyed the salmon pink color for market, as they're fed pellets and not krill the flesh is white when harvested).