It is really impossible to say more than that it is a fish from the bintan-group. That means, it can be everyting from bintan, rubrimontis, alfredi, tweediei, opallios, and all the forms from Sumatra (as for example specc. Sungaibertam, Dabo, Pematunglumut, and many others). Probably, the ones with much red in the fins (tweediei, alfredi, phoenicurus) could be ruled out. Certainly nagyi and allani can be ruled out.
The species of the bintan group are largely defined on the display colours of the male; that’s problematic, but it is the state of the art in Parosphromenus-taxonomics. That means that you have to wait until your males show full courtship colours and then take good sharp photos. Give good changing food, prefer a subdued lighting and be sure that the water meets the conditions. In some weeks time we can have another try.