Pale headed mandarin dragonet

[Arcticreef]

Hi. I've had my mandarin dragonet for about 6 weeks. My 6 month old tank has a fair amount of copepods and tonnes of isopods so I figure he is eating well. However I have noticed over the last week that its head is getting paler in color. The body is glorious but the head not as much. Apart from that it flutters around as expected and appears healthy

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Is the palehead normal? Is it a defining characteristic of one of the sexes? Or it needs more sunshine (LED)? It looks a lot more paler than in the attached photo I took.

 

[SaltyT]

I don't keep mandarins, but I'll try to help you get an answer... bump! #reefsquad