what is the best way to trigger them to want to pair/spawn? i figure theres 3 females for him to choose from,only time he really displays to them is at water changes and lights off.
I don’t do anything special for mine. If I plan to raise the fry I will do a slightly cool water change when I see the females egg tube start going down. I’ll also feed a little more a couple days before they spawn.
Yours look plenty old enough to spawn, but if they aren’t it might be because the female doesn’t feel “safe”. If that makes sense.
Too many tank mates might keep a pair from spawning if they feel too bothered. You can remove the others and any other occupants you can see them chasing off. That might be all you need to do.