Presently there are opallios on the European market. P. tweediei and especially P. phoenicurus have never been traded at all. All our stock (and there is quite big a stock of both species) are from private expeditions. It is probable that tweediei will be in trade sooner or later, but I should rule out phoenicurus. They are fould in one small place on Sumatra only, and never has a commercial fish-catcher been seen there.
Some years ago there were fish in the trade that we called spec. Kota Tinggi, which look somewhat in-between tweediei and alfredi. But we have not seen them again for years. Their status is unclear.
If one is lucky to get an answer to this, the second question is at which location it has been found. This question will (or could) nearly never been answered. (There was an exception: spec. Ampah).
If fish are from private breeders (which is extremely rare) the name should be obtained. Then it is easier to follow the lines of descendance,