I again take the risk to make a fool of myself – but is there a chance that this might be P. phoenicurus?
If you look at the phoenicurus’ species portrait, in the gallery on the bottom of the page, there are younger males in the background of some of the pictures (at least I think so…) which haven’t developed full colouration and remind me of the looming colour pattern of my possible male. And the depicted female also seems to be similar to mine…….. I think there aren’t so many species with this red colour in the unpaired fins.
@Helene: Something catched my eye: the species name “phoenicurus” in the title ought to be written in small letters, and the link list to the other species is not visible on the right side of the page. In species “gunawani” it’s the same. Hope it’s ok to tell you here in this thread, even though it’s off topic.