The pale colors just may be a result of him being in a new setting and quarantine. Fish do tend to pale out when under stress. A good natural color enhancer is astaxanthin, this is used by commercial fish farms to give farm raised salmon a nice pink color to their flesh. I've tried to locate it in it's pure form but it is rare and pricy (it's extracted from a marine algae/plankton from what I understand) Fortunately it is also found in good concentrations in krill, so I supplement my fishes diet with frozen krill as a treat.
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