Metallic shrimpgoby 2

The body color of this goby is "Metallic".
You can see the profile on my past gallery
vol.19.

I like sober tones,which remind me of autumn color.

I have one question.
Watching many gobies,I often see that gobies put a very small sand at the top of the head,between the eyes,just like this photo.

Does it have some reason?

depth : 78ft / 24m
Mabul I.,Sabah,Malaysia
Oct 1999

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