Hello Mr. ummm
I have a definate pair, The male has bigger "bush" growing on top its eyes and is longer, slimmer and has the 4 1st spines in the fin behind its anus longer.
They have been showing courtship behavior for some time, with the male showing off a total contrast in colour, turning white pinkish with black dots, his main hangout place is a hollow tube like cave and the female has never been aloud to be there, but yesterday she was in there with the male and he came out continuosly shakeing like he was squirting sperm over eggs.
Also the female is alot slimmer today, she was almost round over the middle.
I can take the cave out of the tank with no effort, and I am gonna see what happens. Maybe the eggs are not fertile as experience at least in freshwater tells me that The males are often not up to their task in the 1st rounds. But I´ll see what happens.