Fast Water Fish for Pl*co Tanks?

I just set up a driftwood snag for my wood eating pl*cs (Panaque & Panaqolus). The current is pretty strong with 2x2,200liter per hour powerheads to provide the current for my 75 gal tank. I'd like to have some fish that fight the current, some fastwater fish.

I had already thought of neons and cardinals but the current ones here die too easily (maybe because of in-breeding?). Are there any other fastwater fish that can be recommended for pl*co tanks (preferably no fin nipping and with some color)?

I've already decided to adorn my black water main river channel set up with marbel angel fish. Any suggestions are always most welcome. Thank you.

Mike D.

BTW, hopefully these fish will stay within the middle to upper strata of the aquarium. I don't want them hiding under and behind the driftwood.

A friend has suggested Silver Dollars and another has offered Rhapiodon Vulupnus? What is that? Cartman offered hatchet fish. Unfortunately hatchet fishes haven't been seen here for years.

Are Giant Danios from South America? Dang! I forgot to include that little detail. Giant Danios would have been fine. Since I am trying to simulate a biotope from South America, I have to have a South American fastwater swimmer. Sorry again. I hope that clears up everything. I still need the help. Thanks.

My temperature is very high, I'm afraid.