scarlet badis

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...

i was wonder how much more dario dario i could ad to my aquarium? The tank is planted densely with clear territories and hiding places. dimensions: 61x41x58cm current stocking: 10 green neon tetra 3 sparkling gourami 3 otocinclus some cherry shrimp 5 scarlet badis im already planning...