These fish are definitely not phoenicurus. The main determination marker for that species (the one which rightly is mentioned as decisive in the scientific dscription) is the structure and colouring of the caudal. Your fish have normal bintan-like caudals. A faint reddish tone in the unpaired fins could occur even with females of some species in typical situations. You must be more patient, and then we must have good photos which is difficult, I know.
If your fish is from trade (and a private breeder would have given you a correct determination), then this is an additional hint that it is not phoenicurus. This species was never traded. All fish we have originate from one private import by H. Linke. Presently the species is distributed at three or four breeders in Germany only; the best is our member Martin Fischer (Würzburg), author of our Wikipedia-site. There is no indication whatsoever that the trade has detected this species already, for two reasons. First: The species-description is too new; that may be different next year. But second: We know it from one small location only; too tiny for commercial aims. Only if new locations could be detected this will have an effect on the traders. But I doubt it. The characteristic of this part of Sumatra in the Jambi-district is the rather close neighbourship of several similar forms nevertheless distinct. We know of very few locations with two species occuring together in one habitat. In all of these cases the two are clearly distinct not only by structure and colour, but mainly by the ecologic niche they inhabit. All this is not the case with those Sumatra-Paros.
German members of the P-P should, if possible, avoid – with a few exceptions, the most recent is spec. Ampah – fish from trade because of several reasons:
1. We have enough breeders with clearly determined stocks.
2. Many of these originate from privately wild caught animals with known and clear location.
3. Many species are available.
4. Everybody who does not know where and how should use the Distribution-button in our main-menue. There he/she will be directed to a breeder.
5. Even now, in winter time, some breeders will send the fish safely by parcel. I do not know of any other fish which could be such safely shipped in tinyest amounts of water.
6. Fish from trade are in rather many cases wrongly determined, often badly handled for long periods (no adequate food, no quietude, etc.), and therefore often in bad health.
7. Even in Asia already fish that are somewhat similar looking are thrown together in one tank by the catchers already when their catch at one place was too poor.
8. There most likely have been hybrids (at least between bintan-like forms) in the trade already not caused intentionally but because of negligence and improper care.