Just for future reference you should never purchase a fish that is in anything but top shape as there will be a reason it is not.
The greying (lack of colour) may be the result of a light fungal infection so observe the fish carefully, or, stress in the LFS tank.
You should be feeding garlic extract (garlic extreme0 and selcon both of which add to the health of your fish. Selcon contains vitamins and other stuff which may assist in the colouring of your fish.
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