From past forums and convos with other reefers.. no one has ever known how to ID these nems.. well I honestly feel like I know the difference between them after owning them in the past.. it’s been right under our noses. I think the difference lays upon the mouth. Looking over pics and different specimen. There’s is always those with tight mouth and the others with the big lips. I’ve seen my big lip nems in my tank release sperm after wc a bit cooler ending photoperiod.. So my guess is big lip like left nem is male and small mouth like right are female.. hope this observation helps others when buying nems.
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