r/dario

I need help identifying this black Tiger Dario. I’ve been told that it was a female, but now I am unsure. looks more colorful in the photo than it is due to tannins on the water

I've had these guys for a long time and have believed them to be a pair, but I'm not super sure because there has never been any mating/territorial behavior (however, they live with two small platy girls and the male will bite them if they get in his way).

I'd actually want to spawn them at some point (without the platies present lol), so I'd just like to know why I haven't seen any spawning behavior thus far. Could it be that they do spawn when I'm not looking and the platies eat all the eggs? Every single egg over the course of the year that I've had them?