Sexing Yasha Gobies?

Texsun

New member
I've been searching for a Yasha goby and happened upon two (2) at a great price. They were sold to me as a pair but I have my doubts since they were on opposite sides of the holding tank and didn't appear the least bit interested in one another.

I've read of spots on the fin as one possible indicator but nothing substantial. Just curious if someone's heard of a reliable indicator.
 
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