Bobby
I can't always tell by the pictures, I'm more of watching their behavior together. There are some reliable visual clues such as size, with the male being larger, forehead ieswith the male developing a hump while the female stays smooth being two that work well with Lamps. Another good visual clue with this species is that the male will turn darker, almost black mainly when getting ready to breed but I have had males that have stayed dark most of the time, mainly older males. I hope this has helped you.
From the pictures of your two together, I would say they were a pair.
Thanks,
Daniel