The first 2 pics look male to me. The 3rd is harder to tell...judging by the longer pointed anal fin it might be male too. I assume they're fairly small, yes?
What size is your tank? It's difficult to keep even 2 8 inch adult males in any tank less than 6 feet long. They will fight, often to the death of smaller ones. A pair may also kill all other fish so they can breed without interlopers.
A single Texas might be more compatible other fish but it can be iffy.