I would bet, based on the vent picture you submitted, that "it" is a she. In fact I can see trace amounts of black plums developing on her dorsal fin which can be a strong indicator of a female. (Disclaimer: I know that males can also display black markings on their dorsal fins, so the markings on the dorsal fin are not a guarantee of gender) You had asked about the PN gene. In Thailand it stands for Best Pearl and Head. PN gene fish are rare here in the USA and finding a fertile one can be even more difficult. Both FH are looking good, but the suspected female is not looking like she is developing much of a kok.







