Blue chromis sexing


HI all, is there any known way to sex a pair of blue chromis.
I have heard it is visually impossible.
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Point 4 in the following is the closest I can find:
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Thank you, and appreciate the info the green look awesome too.
Seems behavior is the tell tail sign.
One of the two I have seems to go in and out of the live rock in the same place all the time and the other seems to be the watch out, similar behaviors to my pink/yellow damsels. One will even chaise the chromis away if they even get close to there little den.
To me the watch out seems to be the male like the clowns.
And both fish are the smaller of the two as well.

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