Ughhhhh I don't wanna take it out the tank for a while.....They're not really dimorphic.
I want to say male but I've seen plenty of females with big domers.
Only way to be sure is to vent.
That's what I considered. If it's a male if want to breed it with my KKP asap.Call it whatever you want until it's tube is more visible or until it lays eggs.