I assume you have G. altifrons.
Firstly, you have the sexes muddled.
It is the male who is the one with the long fins. Where did you purchase these as a "breeding Pair"?
The smaller rounded fin one is the female unless it is a subordinate male who is being pestered by the male and is hiding.
Geos dig so get used to it. They wont stop, only get more busy.
How big is the tank?