Sverting, this is really interesting information. I think that both species are possible; they have been imported before several times.
P. filamentosus presently could be the new spec. Ampah: somewhat similar to filamentosus, less colourful (sometimes appearing “black-and-white”) but not less interesting looking. There have obviously been imports of Ampah called filamentosus. We’ll see. I recommend both – filamentosus and spec. Ampah – very much.
P. anjunganensis has been less often imported, but it has; and it is very much recommendable to buy it, although it is a bit less easy to keep and breed. The water values must be respected more exactly as with filamentosus. But from the point of the project it is especially good to try anjunganensis because we have only small stocks of this fish.
400 of each is a great number; too much I think. They won’t find enough aquarists for them.
The fish must be wild caught. Nobody breeds 400 filamentosus, not to speak of anjunganensis. It’s the first weeks of the new breeding season in nature now; most fish will still be rather small.
Please post the photos as soon as you get them. If there are some adult males among them we could tell whether both species are rightly determined.