Just want to edit this post to mention that this should have been written with my own profile Helene, and not parosphr which is the admin account.
Just so that you know who is answering 🙂
I understand your little bit of confusion 🙂 …
Considering the first photo which showed a clear linkei and some other species, to me it would be clear that the species may well have been mixed so I would keep that as a possibility all the way. (thinking of what you mention about different length of dorsal fins)
The males are clearly something in the line of ‘bintan’, but to say clearly is also really difficult. But bintan-like is maybe the best we can say at this moment. There are so many variations in this ‘line’ so its too hard to tell.
I think the males we can see clearly here, are quite beautiful and also interesting, – I cannot really say something more precise about them.
I would look out for a male and female that clearly ‘clicked’ and take them to a separate tank ( to get more flashing 🙂 and better photos, – and because I would then assume they might be same species)