fish sexing

Hi everyone, I recently (2 weeks ago) bought a pair of Apistogramma Borelli and added then to my community Tank, (Neon-Tetras, Amanos). They were a lot smaller on pickup and had no color. They were rather territorial and fought each other every now and then. But they are evenly matched and no...

I recently got what i thought was a pair of scarlet badis for my 10 gallon shrimp tank. One's colorful like i'd expect of a male and the other is kinda dull so i thought they were a male and female. But i notice the brighter colored one chasing the other away every time they see each other and...