as long as they have hiding places... caves or so on...
in the Xingu (or Rio Iriri) around Sao Felix, they live in the main channel of the river, quite deep into it... so probably not so much light, very poor (not to say inexistant) vegetation, "aufwuchs" on the rocks, sand and that's it...
IMO, the best Pseuda tank would be set up around a deep couch of clear sand, a few rounded rocks burried in it (to create several territories), one or two branches of soft wood to provide shadow and a very strong current (with a TUNZE Stream or something so) and, to help chance, some caves (natural under/between the rocks) or spawning tubes like I had...
again, it's not because I was lucky twice, that I know the Truth about them...
as my signature mention : no solution, just experiences...