Thanks so much for all the replies!
I’m hoping that the bogwood will help to reduce the pH a little (bogwood only been there a week), but as a novice I’m probably not best placed to fiddle around with chemical additives to reduce the pH myself – might cause more problems than it resolves! I’m sending up a little prayer that they’ll become acclimatised to it over time, as long as it’s consistent. Will check effects of bogwood on the alkalinity in a few more days.
Re the photos – I’d say mine are definitely more washed out than even your “pale” pic. Of the two males, the more aggressive one has a yellowy hue but a more distinctive black
stripe and spot, whilst the one who gets hounded away from one side of the tank
has a rosy-grey hue, and his black markings are less distinct.
The dorsal fins are generally flattened - I’ve only seen the spines fully upright a few times. Funnily enough, based on the black spines I’d say I had a male and a female, but I’m relying on the upward slope between spawning tube and anal fin for sexing, which indicates that they are both male! That, and the chasing………..and that the LFS thought they were both male…….
The tank is quite nicely divided, but they tend to come to the front for feeding, and one then chases the other away. I can creep up to the tank and they come forward to check out the offerings, but if I raise a camera to tank level they dash off to hide! So I can’t even get any pics, this is the best I’ve managed so far, this is the “chasee”…….
I’m hoping that the bogwood will help to reduce the pH a little (bogwood only been there a week), but as a novice I’m probably not best placed to fiddle around with chemical additives to reduce the pH myself – might cause more problems than it resolves! I’m sending up a little prayer that they’ll become acclimatised to it over time, as long as it’s consistent. Will check effects of bogwood on the alkalinity in a few more days.
Re the photos – I’d say mine are definitely more washed out than even your “pale” pic. Of the two males, the more aggressive one has a yellowy hue but a more distinctive black
stripe and spot, whilst the one who gets hounded away from one side of the tank
has a rosy-grey hue, and his black markings are less distinct.
The dorsal fins are generally flattened - I’ve only seen the spines fully upright a few times. Funnily enough, based on the black spines I’d say I had a male and a female, but I’m relying on the upward slope between spawning tube and anal fin for sexing, which indicates that they are both male! That, and the chasing………..and that the LFS thought they were both male…….
The tank is quite nicely divided, but they tend to come to the front for feeding, and one then chases the other away. I can creep up to the tank and they come forward to check out the offerings, but if I raise a camera to tank level they dash off to hide! So I can’t even get any pics, this is the best I’ve managed so far, this is the “chasee”…….
After I re-scaped the decor a bit and added more bogwood to create more territories, suddenly they became friends.....and in fact became virtually inseparable, swimming closely enough to be 
