Reef nutrition

Sexual dimorphism

Hey all, I come to you all yet again with another question -two actually

I was informed that the yellow coris wrasse (Halichoeres chrysus) is sexually dimorphic; can any one enlighten me as to how to tell them apart?

Also, similar question, only for the tail spot blenny (Ecsenius stigmatura). Are they sexually dimorphic, and if so, how do you distinguish the two sexes?
 
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